https://sudoku-sleuth.com/2026-09-24 https://sudoku-sleuth.com/cases2026-09-24 https://sudoku-sleuth.com/variants2026-09-24 https://sudoku-sleuth.com/videos2026-09-24 https://sudoku-sleuth.com/variants/killer2026-09-24 https://sudoku-sleuth.com/variants/kropki2026-09-24 https://sudoku-sleuth.com/variants/thermo2026-09-24 https://sudoku-sleuth.com/variants/arrow2026-09-24 https://sudoku-sleuth.com/variants/renban2026-09-24 https://sudoku-sleuth.com/variants/kropki-ratio2026-09-24 https://sudoku-sleuth.com/variants/german-whisper2026-09-24 https://sudoku-sleuth.com/variants/little-killer2026-09-24 https://sudoku-sleuth.com/variants/modular2026-09-24 https://sudoku-sleuth.com/variants/quadruple2026-09-24 https://sudoku-sleuth.com/variants/anti-knight2026-09-24 https://sudoku-sleuth.com/variants/whisper-52026-09-24 https://sudoku-sleuth.com/variants/region-sum2026-09-24 https://sudoku-sleuth.com/variants/whisper-42026-09-24 https://sudoku-sleuth.com/variants/diagonal-sum2026-09-24 https://sudoku-sleuth.com/variants/consecutive2026-09-24 https://sudoku-sleuth.com/variants/dutch-whisper2026-09-24 https://sudoku-sleuth.com/variants/xv2026-09-24 https://sudoku-sleuth.com/variants/entropic2026-09-24 https://sudoku-sleuth.com/variants/zipper2026-09-24 https://sudoku-sleuth.com/variants/kropki-difference2026-09-24 https://sudoku-sleuth.com/variants/sandwich2026-09-24 https://sudoku-sleuth.com/variants/x-sum2026-09-24 https://sudoku-sleuth.com/variants/fog-of-war2026-09-24 https://sudoku-sleuth.com/variants/skyscraper2026-09-24 https://sudoku-sleuth.com/variants/diagonal2026-09-24 https://sudoku-sleuth.com/variants/between2026-09-24 https://sudoku-sleuth.com/variants/palindrome2026-09-24 https://sudoku-sleuth.com/variants/anti-king2026-09-24 https://sudoku-sleuth.com/variants/nabner2026-09-24 https://sudoku-sleuth.com/variants/slow-thermo2026-09-24 https://sudoku-sleuth.com/variants/non-consecutive2026-09-24 https://sudoku-sleuth.com/variants/double-arrow2026-09-24 https://sudoku-sleuth.com/variants/parity-line2026-09-24 https://sudoku-sleuth.com/variants/disjoint2026-09-24 https://sudoku-sleuth.com/variants/even-odd2026-09-24 https://sudoku-sleuth.com/variants/1-5-92026-09-24 https://sudoku-sleuth.com/variants/even2026-09-24 https://sudoku-sleuth.com/variants/outside2026-09-24 https://sudoku-sleuth.com/variants/x102026-09-24 https://sudoku-sleuth.com/variants/xv-negative2026-09-24 https://sudoku-sleuth.com/variants/arrowpill2026-09-24 https://sudoku-sleuth.com/variants/columnindex2026-09-24 https://sudoku-sleuth.com/variants/fortress2026-09-24 https://sudoku-sleuth.com/variants/lockout2026-09-24 https://sudoku-sleuth.com/variants/numbered-rooms2026-09-24 https://sudoku-sleuth.com/variants/odd2026-09-24 https://sudoku-sleuth.com/variants/cage-no-sum2026-09-24 https://sudoku-sleuth.com/variants/isotropic2026-09-24 https://sudoku-sleuth.com/variants/kropki-negative2026-09-24 https://sudoku-sleuth.com/variants/min-max2026-09-24 https://sudoku-sleuth.com/variants/rowindex2026-09-24 https://sudoku-sleuth.com/variants/unimodular2026-09-24 https://sudoku-sleuth.com/variants/v52026-09-24 https://sudoku-sleuth.com/variants/x-neg2026-09-24 https://sudoku-sleuth.com/variants/clone2026-09-24 https://sudoku-sleuth.com/variants/extra-region2026-09-24 https://sudoku-sleuth.com/variants/global-entropy2026-09-24 https://sudoku-sleuth.com/variants/kropki-ratio-neg2026-09-24 https://sudoku-sleuth.com/variants/runsums2026-09-24 https://sudoku-sleuth.com/variants/whispers-52026-09-24 https://sudoku-sleuth.com/lessons/killer-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/killer-rule/ca04938b9511bc4b730b4f3002dbd4fc552eb6a01b96af2a9f5e12cffec0bc8f.jpgKiller Sudoku rules: cage sums and no repeated digitsLearn Killer Sudoku cage rules with a worked example: add the digits to the clue, avoid repeats, then use a column to place them.https://sudoku-sleuth.com/lessons/v1/killer-rule/c3f9e9a19f8eabffc200c72651d582a6750a434660a5b81cc7ac4a2912799e3d.mp4482026-09-28T10:33:24.000Z https://sudoku-sleuth.com/lessons/killer-combinations2026-09-28https://sudoku-sleuth.com/lessons/v1/killer-combinations/5b5f1295fcd547d685c9a31aa10a25e7bb2c1d86cd502cbce8f61e27040ceddb.jpgKiller Sudoku cage combinations: find the digits in a small cageA three-cell Killer cage totalling 6 must contain 1, 2 and 3. Learn how column clues turn that combination into a placed digit.https://sudoku-sleuth.com/lessons/v1/killer-combinations/b0e1c7befaf92186572178e812d686530539734cb4923813279a0f95573fcaa3.mp4322026-09-28T10:33:29.000Z https://sudoku-sleuth.com/lessons/killer-rule-of-452026-09-28https://sudoku-sleuth.com/lessons/v1/killer-rule-of-45/63b7085c09cc8fa1aab774cec3ff78c82ca3e36b56f007e913e8f1bf324c5853.jpgKiller Sudoku rule of 45: find a missing digit in a rowEvery Sudoku row totals 45. Subtract complete Killer cages inside a row to find its uncovered cell, with a short worked example.https://sudoku-sleuth.com/lessons/v1/killer-rule-of-45/733cf465395114e399b245646c74b5e9d6b627e7337c2131e32b6407ae600cec.mp4402026-09-28T10:33:35.000Z https://sudoku-sleuth.com/lessons/killer-outies2026-09-28https://sudoku-sleuth.com/lessons/v1/killer-outies/e6b2a94fa5765525081087ecc2f84206f73e180db752a99a2facfa5323c5dac2.jpgKiller Sudoku: Find an outie from a Killer boxA Sudoku box also contains one through nine, so it totals forty-five. Here, three Killer cages cover the whole box. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/killer-outies/34d7bbca2b928cfcef6a8afa9bb36d8e8414a8b1ccf85baf5f01fb941aa83a0e.mp4472026-09-28T10:33:41.000Z https://sudoku-sleuth.com/lessons/thermo-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/thermo-rule/cd689e168feadb29666bfc928a9085dc69c918791b8c4d7837fcdd3ba25cb42f.jpgThermo Sudoku: How a thermometer risesDigits strictly increase from the bulb to the tip of each thermometer. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/thermo-rule/81e8354291cf5d80bd2bc3881b48df2f513e5b56c27f8780c768af656353e533.mp4332026-09-28T10:33:45.000Z https://sudoku-sleuth.com/lessons/slow-thermo-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/slow-thermo-rule/4de6142b4118606c78e20038b763353211cf5cf3dd8778672f92745bc22a6c09.jpgSlow thermo Sudoku: How a slow thermometer risesDigits on a slow thermometer never decrease from the bulb; they may stay equal where Sudoku allows it. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/slow-thermo-rule/e1dff20526fb28bfe05e72d2dcc1a7cbf1f43eb0edc636c5dd2ff6229245a8e9.mp4322026-09-28T10:33:49.000Z https://sudoku-sleuth.com/lessons/arrow-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/arrow-rule/71358e52cc16696e23cbd6107a1f2c98a16034b5a40e9997baf06bc4751435a8.jpgArrow Sudoku: How an arrow adds upThe digits on an arrow sum to the digit in its circle. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/arrow-rule/08bb90f130a62cdd453c74d916c5f5943f9f67b69379a791ce047c66ab312249.mp4382026-09-28T10:33:53.000Z https://sudoku-sleuth.com/lessons/arrow-pill-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/arrow-pill-rule/0b25cc2c94dbb18c9b0e3fa9b2ab63395dbf0e6e04af6a8742ad9ca66d165941.jpgArrowpill Sudoku: Reading a two-digit arrow pillA multi-cell arrow pill is read left to right or top to bottom as one number. The shaft digits sum to that number. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/arrow-pill-rule/274bea04c967131f4fc8c6fc34dd91fdf11ca7c918278c7026551e18cfd07613.mp4362026-09-28T10:33:58.000Z https://sudoku-sleuth.com/lessons/kropki-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/kropki-rule/8f552606cbcf68ef17585690e8708655c1bf20d2f047ed6d213d09d4f497bc67.jpgKropki Sudoku: How Kropki dots workWhite dots join consecutive digits. Black dots join digits in a one-to-two ratio. Pairs without dots are free. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/kropki-rule/85fcb8e56a4e6ceb91c142c57f90a5f1f902463a55cbdb15c0d21dbf09291717.mp4412026-09-28T10:34:03.000Z https://sudoku-sleuth.com/lessons/kropki-negative-black-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/kropki-negative-black-rule/a10251e41994a3ad9f6bf80760fa1f1360ffb9df698dcfe83408d7f3d564a24e.jpgKropki ratio neg Sudoku: When every black dot is shownAll markers named in this lesson are shown. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/kropki-negative-black-rule/d437e3f66fba8363737b0338752fbc586e6d823599fef666e90b42a364db5e7d.mp4322026-09-28T10:34:07.000Z https://sudoku-sleuth.com/lessons/kropki-negative-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/kropki-negative-rule/3d22e963e9302beaac73a47069d38d0644dcba4631d4dcfc52fe053cce569fa0.jpgKropki (negative) Sudoku: When every Kropki dot is shownAll markers named in this lesson are shown. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/kropki-negative-rule/c82a939481394c0c837c0d8256098d445b2cea39ec29ad837dafac3ca544e83c.mp4332026-09-28T10:35:10.000Z https://sudoku-sleuth.com/lessons/german-whisper-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/german-whisper-rule/223347b8512f828349eacbc9a812a15470e53df4d65878b19d100ad9cee166be.jpgGerman whisper Sudoku: How German Whisper lines workAdjacent digits along a green line differ by at least five. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/german-whisper-rule/53b032266365cd3401689a6ffcb2dc8ca15d658c6c7418c82dc631e89caee46e.mp4372026-09-28T10:35:15.000Z https://sudoku-sleuth.com/lessons/dutch-whisper-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/dutch-whisper-rule/7327d66aab7d08e941293f5275c0e02e034981c7f3f99dbfa3ab3f839277721e.jpgDutch whisper Sudoku: How far a Dutch whisper jumpsAdjacent digits on a Dutch whisper line differ by at least four. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/dutch-whisper-rule/393d2cd1f6894d71e7a4261124f9998a415a9ab4f256c1feb9f7e8a9b890187b.mp4332026-09-28T10:35:19.000Z https://sudoku-sleuth.com/lessons/renban-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/renban-rule/18792ef474653ab7c0b6b5aa63f62a98e9a131f522c28e21fac40d43565b7723.jpgRenban Sudoku: How Renban lines workThe digits on a Renban line form a consecutive set without repeats, in any order. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/renban-rule/d30e1c6f427bc2305e40a713449301dfa215d6c4fa89513c08175fa052aa172e.mp4432026-09-28T10:35:24.000Z https://sudoku-sleuth.com/lessons/palindrome-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/palindrome-rule/6d14073f2d0fd5ad825679114cef43681a40e0adb03aff35be2f81e4d614f9ab.jpgPalindrome Sudoku: How a palindrome line readsDigits on the marked line read the same from either end. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/palindrome-rule/f543f0d4631f673e4038f67b66dfc0f2cd956442e06d1ca94108006ce6d9cdb6.mp4352026-09-28T10:35:30.000Z https://sudoku-sleuth.com/lessons/parity-line-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/parity-line-rule/6cefe73007e079bcbf3c18baebe220a8c231fa34fb8a2f6b95f0892dfac52ba0.jpgParity line Sudoku: How a parity line alternatesAdjacent digits on a parity line alternate between odd and even. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/parity-line-rule/8254745fa8e2a078bc9a28e715abe7ccdf33ac1d9946b5fef7aa44a840779037.mp4342026-09-28T10:35:36.000Z https://sudoku-sleuth.com/lessons/xv-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/xv-rule/3c6ac9d156ccf196234f881f15c599f4a51453957ea09476bd2bbc0c579903f4.jpgXV Sudoku: What X and V meanDigits separated by an X add to 10. Digits separated by a V add to 5. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/xv-rule/7ba2e1d27e1f8b23547d29f7db222cb7ef1ff5520fdcf190758e82bd2262d405.mp4302026-09-28T10:35:42.000Z https://sudoku-sleuth.com/lessons/xv-negative-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/xv-negative-rule/ca1fa509c6a143a01179a4c8331ead2de28b3e70e4ad072d278c0d7c7639244c.jpgXV (negative) Sudoku: When every X and V is shownAll markers named in this lesson are shown. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/xv-negative-rule/5421af76a1f7c5b91f1233bc8b82b035679024565684bd19791b750eb224d154.mp4322026-09-28T10:35:46.000Z https://sudoku-sleuth.com/lessons/lockout-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/lockout-rule/d117dd5fb9b352420e4ce28addc26559e7fcd52bc93d0f2bf7ee9634f02cd4fd.jpgLockout Sudoku: How a lockout line worksDiamond end digits differ by at least four. Digits on the line are strictly outside the interval between the ends. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/lockout-rule/ffadb73d46f2752ef0d0edf51f7b49b8361f84adb7bb3cac8e13e56513277049.mp4442026-09-28T10:35:50.000Z https://sudoku-sleuth.com/lessons/min-max-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/min-max-rule/b6260f2859a973f4e33f0e5516f537eacb165382d997b335972354b131d3c12e.jpgMin max Sudoku: How minimum and maximum cells workBlue inward-arrow cells are smaller than all orthogonal neighbours. Yellow outward-arrow cells are larger than all orthogonal neighbours. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/min-max-rule/c074198730e17bfbfc7e1cb85ce949108cff39b15a744454ca31eab242c1bebc.mp4342026-09-28T10:35:54.000Z https://sudoku-sleuth.com/lessons/sandwich-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/sandwich-rule/1d8281ee1cb0910eecf997927bd38c867d4eba42817b8f572caaf7aff52db8b8.jpgSandwich Sudoku: How a Sandwich sum worksThe outside clue is the sum of the digits strictly between 1 and 9 in its row. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/sandwich-rule/1d4f91c8fa29b1a2af3660d4c60dab36d88950a704255ed44ae5e6cc9bd5b9a4.mp4322026-09-28T10:35:59.000Z https://sudoku-sleuth.com/lessons/skyscraper-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/skyscraper-rule/9a3fcd7611ea78ec7e8f92474c5678f039a67b5942cb9c75bbc463360892fdd8.jpgSkyscraper Sudoku: How a Skyscraper clue worksRead the digits as building heights from the outside clue. A taller digit hides shorter digits behind it; the clue counts visible buildings. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/skyscraper-rule/f704c531b8d9f09c5d461de2cdf6b8a3b35e2df87c94cbc19cf008fb15ed9770.mp4372026-09-28T10:36:04.000Z https://sudoku-sleuth.com/lessons/anti-knight-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/anti-knight-rule/dcaba9d60fd22437e9d3c9e4bfea646da4c773a1a0ce88a5841ac6c86e0366c1.jpgAnti-knight Sudoku: How the anti-knight rule worksCells a chess knight's move apart cannot hold the same digit. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/anti-knight-rule/1b6d2ca6350bbeb7a899e39eee679894f1103ce718701ba23f584840289ee570.mp4402026-09-28T10:36:08.000Z https://sudoku-sleuth.com/lessons/anti-king-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/anti-king-rule/ca937b434ab757fe35bbc3cb5baf00d094611165fadb427de6b48bea29f71cf2.jpgAnti-king Sudoku: How the anti-king rule worksCells a chess king's move apart cannot hold the same digit, including diagonals. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/anti-king-rule/aa046d9fd43030896257e5f72f8843032441453f7951a3caa08ff0bb8bdab9e6.mp4382026-09-28T10:36:12.000Z https://sudoku-sleuth.com/lessons/non-consecutive-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/non-consecutive-rule/2ef8721b3b761deef0489400bdce77849395303c553d80b5abbe16635687bee2.jpgNon-consecutive Sudoku: How the non-consecutive rule worksOrthogonally adjacent cells cannot hold consecutive digits. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/non-consecutive-rule/d4b7b9862d2694dad2e31ba2c7c03ef2ac75c663da2f02f812dfe175a8176a3d.mp4402026-09-28T10:36:17.000Z https://sudoku-sleuth.com/lessons/between-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/between-rule/316f7d2b72cb01a8d78ef4cfa30c43ebc7700699b70b9dc318dc9ff65b981fce.jpgBetween Sudoku: What lies between the circlesEvery digit on the line lies strictly between the digits in its end circles. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/between-rule/585ab80d7afbe66eadc663ef64ce7ec442953f6af73c2f9b07427e72d9ef2a6f.mp4232026-09-28T10:36:20.000Z https://sudoku-sleuth.com/lessons/entropic-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/entropic-rule/b35abcb79a60f6ae201740e9295f9a10d3a0c937fac044504368b0e84d70d324.jpgEntropic Sudoku: How an entropic line groups digitsAny three consecutive line cells hold one low (1–3), one middle (4–6), and one high (7–9) digit. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/entropic-rule/ac96fa046af00117385b40e0a430a4749896434627d5ed6c9eac2d382410d23a.mp4392026-09-28T10:36:24.000Z https://sudoku-sleuth.com/lessons/fog-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/fog-rule/774a596585f7ce937d0a450f78b9986c0215137324e785df95893e0554ceaca8.jpgFog of war Sudoku: How fog of war worksMost clues start hidden. A correct placement reveals its three-by-three neighbourhood. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/fog-rule/acecba44807e501dc79c5b84eb7c1d38bd835c731fcea3738a6ecb5eaca3b0e5.mp4412026-09-28T10:36:30.000Z https://sudoku-sleuth.com/lessons/fortress-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/fortress-rule/cf8edc8b66a67953c647c196eb86a6292a5e59b7dbb359041358e6df4cd36067.jpgFortress Sudoku: How fortress cells workA shaded fortress cell is larger than each orthogonally adjacent unshaded cell. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/fortress-rule/dbef0b34556d7067a284b983843747994c8dd77c81b2d3ef0194c94d29ef01cb.mp4342026-09-28T10:36:38.000Z https://sudoku-sleuth.com/lessons/global-entropy-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/global-entropy-rule/1a229d2167e7ce8156abe5f7ad11e98d760624cfcc24afb20f37b70dcd481e5d.jpgGlobal entropy Sudoku: Every small square needs all three bandsEvery overlapping two-by-two square contains a low digit (1–3), a middle digit (4–6), and a high digit (7–9). Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/global-entropy-rule/697cd7d924df511d61003ed8e7a2987826b49893ab486b8b2bafec1b41848421.mp4392026-09-28T10:36:45.000Z https://sudoku-sleuth.com/lessons/modular-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/modular-rule/decfcfd7aa7235e90d72cefa21cbd79061eb58632a697a3ccf710c2d9197db2b.jpgModular Sudoku: How a modular line cyclesAny three consecutive line cells hold one digit from each group: {1,4,7}, {2,5,8}, and {3,6,9}. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/modular-rule/0adfbf0b4bdc3d4617d5f941ca134afcfc0ac8706f9e29d5dbc2229f6a6f297b.mp4392026-09-28T10:36:51.000Z https://sudoku-sleuth.com/lessons/quadruple-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/quadruple-rule/0f398d0fd8a65cbabc53cd5ac2e091cfca04d4038d1e838819b7a399415a2cd3.jpgQuadruple Sudoku: Reading a quadruple clueEvery digit in a corner circle appears in one of the four cells touching it. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/quadruple-rule/7d7ae9c36678f3d61bdcc4bf9e28aa4e09e7304940294697a51711fce916abe3.mp4402026-09-28T10:36:58.000Z https://sudoku-sleuth.com/lessons/region-sum-line-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/region-sum-line-rule/2ac9551eb78854dabaa35112c09a16077c028c0584853ab752ebe403bc2cb62f.jpgRegion sum Sudoku: How a region sum line worksEach box segment of a region sum line has the same total. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/region-sum-line-rule/3540e126e0d118c0167125300451f4e7255b9e59794e0751c5f9af43dcc7f07b.mp4312026-09-28T10:37:02.000Z https://sudoku-sleuth.com/lessons/xsum-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/xsum-rule/f02bfe9fed25935852d6e677a05240a900473915595140d3960d62bf5480ddcf.jpgX-sum Sudoku: How an X-sum clue worksThe first digit from the clue gives X. The first X digits, including that digit, add up to the outside clue. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/xsum-rule/be9611a889c3012f2c87c556a62ab747676c0068197905d57405247f452d01f2.mp4352026-09-28T10:37:07.000Z https://sudoku-sleuth.com/lessons/x-negative-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/x-negative-rule/7a383f648eaea0a7c0a1dba13a87a3cdea8c58471f95b11c59147720d3f87a8f.jpgX NEG Sudoku: When every X is shownAll markers named in this lesson are shown. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/x-negative-rule/6f7b5e198681c6b2223604c4ec95b65d1b4fc6d92370594568b6b240f056a31c.mp4322026-09-28T10:37:12.000Z https://sudoku-sleuth.com/lessons/zipper-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/zipper-rule/2720196a78a8d6210c346d95e02079085fdbd18b018d84216abe9c618a6c0125.jpgZipper Sudoku: How a Zipper line worksDigits equally far from the line centre pair to the same total. On an odd line, that total is the centre digit. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/zipper-rule/813d51c61fc210426900d1c8d1332f48d594956a7d11d838a068d0d5fa71b7df.mp4362026-09-28T10:37:16.000Z https://sudoku-sleuth.com/lessons/nabner-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/nabner-rule/b8933d141fffb2a084a4607b192e6f328998b8c9aa856a8bfea89d516723e4a7.jpgNabner Sudoku: How Nabner lines workNo two digits anywhere on a Nabner line are consecutive or repeated. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/nabner-rule/166a3b6c4496628f7ec5f5da4cd7209812aa6c96e5914427b0300b3c91101629.mp4352026-09-28T10:37:22.000Z https://sudoku-sleuth.com/lessons/diagonal-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/diagonal-rule/e4352b0b6f09112503dc4e223ba36d1f358d1e655f3238144f892d717e992a1a.jpgDiagonal Sudoku: How marked diagonals workDigits cannot repeat on the marked diagonal. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/diagonal-rule/8dee302cf0f0979f9aef1a848d71eba2e1f829823a49c1675b7948253f47ca57.mp4322026-09-28T10:37:26.000Z https://sudoku-sleuth.com/lessons/entropic-or-isotropic-diagonal-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/entropic-or-isotropic-diagonal-rule/e90e374b2dfd85ad114bc80ca9be6dcab0c1715d1aaae658fadab2566d8a5276.jpgIsotropic Sudoku: When a diagonal is entropic or isotropicEvery diagonal with at least seven cells, in either direction, is either entropic or isotropic. entropic means every three consecutive cells contain one digit from each of low one-two-three, middle four-five-six, and high seven-eight-nine. isotropic means the entire diagonal stays within one of those groups. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/entropic-or-isotropic-diagonal-rule/cf5db1e49520f637aa3283a29224edfc9ddad3a29fddd5639003655a14c6b1db.mp4632026-09-28T10:37:34.000Z https://sudoku-sleuth.com/lessons/modular-or-unimodular-diagonal-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/modular-or-unimodular-diagonal-rule/c2dcbd0353ebb3005af57886a7555b86284befda037b1e0165c65ffc40ebf099.jpgUnimodular Sudoku: When a diagonal is modular or unimodularEvery diagonal with at least seven cells, in either direction, is either modular or unimodular. modular means every three consecutive cells contain one digit from each of one-four-seven, two-five-eight, and three-six-nine. unimodular means the entire diagonal stays within one of those groups. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/modular-or-unimodular-diagonal-rule/539e618855a48ac5f41d72458e15be35ef9540b448759fb4febbfaf87d80c324.mp4612026-09-28T10:37:41.000Z https://sudoku-sleuth.com/lessons/modular-or-unimodular-every-diagonal-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/modular-or-unimodular-every-diagonal-rule/e990c28a1b3314c42a28effeb2c81b49d994b50552b2d19158dfa47913349bfe.jpgUnimodular Sudoku: Every diagonal is modular or unimodularEvery diagonal, in either direction, is either modular or unimodular. modular means every three consecutive cells contain one digit from each of one-four-seven, two-five-eight, and three-six-nine. unimodular means the entire diagonal stays within one of those groups. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/modular-or-unimodular-every-diagonal-rule/fe44b7e5bbb370b78f1d9bd8c04f03c2a2ddef450856dd358d02d4d7e0f0d42d.mp4552026-09-28T10:37:48.000Z https://sudoku-sleuth.com/lessons/diagonal-sum-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/diagonal-sum-rule/dbcc3916d16e7f578716c96a9a3df7488a1669f53aef6ec249ffdd50b1894cb2.jpgDiagonal sum Sudoku: How a diagonal sum clue worksA clue outside the grid gives the sum along its indicated diagonal. Digits may repeat if ordinary Sudoku rules allow. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/diagonal-sum-rule/88d4d014e1eb0d12d63d5ea51b5f9bb512ffc2f88050bfb443a842f3bd3ef627.mp4322026-09-28T10:37:52.000Z https://sudoku-sleuth.com/lessons/disjoint-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/disjoint-rule/959a2a65ac8ba97370e6adff9c13169cc3da0e840789f84634a79fa788b82ba3.jpgDisjoint Sudoku: How disjoint groups workCells in the same position inside each three-by-three box hold different digits. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/disjoint-rule/39c818ca6b7d79577c6d3753e77756944ab0b44f447015ba3f56c6bfa1de865f.mp4302026-09-28T10:37:56.000Z https://sudoku-sleuth.com/lessons/clone-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/clone-rule/9d2ff6c5af9a6c44bf90608b7d6c37b53a06f6776245d8a2a42dab9627d65d0c.jpgClone Sudoku: Matching clone cellsCells shaded the same colour are clones and contain the same digit. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/clone-rule/0047c5aacc9c2a2da7742d455226874d38b4a31ef07467194ddfb9e528990f1e.mp4202026-09-28T10:38:01.000Z https://sudoku-sleuth.com/lessons/double-arrow-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/double-arrow-rule/fe70372b9044f33888485e8999386e1942a411579dbe4668656236b5d80a63b9.jpgDouble arrow Sudoku: How a double arrow worksThe digits between the circled ends add to the sum of the two end digits. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/double-arrow-rule/b33c2ae64b8bd85334b4767a18dd0f056ac2ffddef7b556c23eb3e987a4eeb04.mp4312026-09-28T10:38:05.000Z https://sudoku-sleuth.com/lessons/irregular-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/irregular-rule/3d20e8ed6bc68902232e94ce81246136aa8181e4b47f96150dd6ed521887d1dd.jpgIrregular Sudoku: How irregular regions workIrregular regions replace the square boxes. Every row, column and region contains 1 to 9 once. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/irregular-rule/a9419becc2cce4b1a9863f7b065ad9e512194c2e2df3f3d8992bd55f6833ae38.mp4312026-09-28T10:38:10.000Z https://sudoku-sleuth.com/lessons/isotropic-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/isotropic-rule/ec682f5fb7f714ed87ed69bd92e9c6379abc7bb076e3c1353ab2bd5ba5201fff.jpgIsotropic Sudoku: An isotropic line stays in one bandDigits on an isotropic line all belong to one entropy band: low 1–3, middle 4–6, or high 7–9. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/isotropic-rule/3e92f28d2197a4b89a19a5fe7566fa064af22b36c653ff59759d49735e9eb811.mp4282026-09-28T10:38:17.000Z https://sudoku-sleuth.com/lessons/outside-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/outside-rule/4aad09efd0913659ed278af2782f1504710e0fd5281f081a4e9eb5d142223e1d.jpgOutside Sudoku: How an outside clue worksThe digit outside the grid must appear in one of the first three cells of the row from that clue. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/outside-rule/9d88d3274974e52b43e18303ec14b9d228543bb87018db92f0e247819bdb8b7a.mp4332026-09-28T10:38:22.000Z https://sudoku-sleuth.com/lessons/x10-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/x10-rule/71f76de48dcdf95cf10228684e968c4bbb6a3307a2cd55ab33993086d0e42e83.jpgX10 Sudoku: How an X pair worksDigits on either side of an X add to 10. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/x10-rule/4605f94bebad7f6d9f21cde9b7fafac7b6a25d835f0ac20ca924baec5545930d.mp4252026-09-28T10:38:27.000Z https://sudoku-sleuth.com/lessons/run-sums-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/run-sums-rule/49bed52d970e9e9eadaf3c2bab2cdeb12295d698f6dd71a0b297971f124c8e8e.jpgRunsums Sudoku: How a run-sum clue worksThe outside clue sums each row digit that has a consecutive digit immediately beside it. A digit with two consecutive neighbours is counted only once. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/run-sums-rule/26aefc0c7c82fc70e6850237b5b7dbc47b89591c2a0a197fc3532aeb1f919d24.mp4492026-09-28T10:38:33.000Z https://sudoku-sleuth.com/lessons/even-odd-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/even-odd-rule/6db678b7f7e23746852d5c569fd5bd0bf58e5e9ac1cdabc662bde60fe111c28b.jpgEven/odd Sudoku: Reading even and odd marksA marked square contains an even digit. A marked circle contains an odd digit. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/even-odd-rule/c51ffbf01641182171cfcf7e568cae2ce2ad42fae95152b7d8099e81addfdad0.mp4342026-09-28T10:38:38.000Z https://sudoku-sleuth.com/lessons/extra-region-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/extra-region-rule/25dfe945dc28fe23cdff02d3e77601cd62db02e1afc1c04e199addcfcd1837be.jpgExtra region Sudoku: Reading an extra regionEach shaded extra region contains the digits 1 through 9 exactly once, in addition to the ordinary rows, columns and boxes. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/extra-region-rule/f51d0074fa6d2583fe93aeadf0adecf22a619c008b5810cb284ad593204e4381.mp4312026-09-28T10:38:42.000Z https://sudoku-sleuth.com/lessons/159-index-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/159-index-rule/1ab4e92218c5de4e05bf1cbf8b6ebc996a799b25b1d51154fb4418d280b5a090.jpg1-5-9 Sudoku: Reading a 1-5-9 indexA digit in an indexed cell tells where that cell’s column number appears in the same row. In a 159 index, columns 1, 5 and 9 are marked. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/159-index-rule/0c497c5b84c479b45332d579accbfa9494d0466406b2b13a9667c0ec1866a286.mp4382026-09-28T10:38:45.000Z https://sudoku-sleuth.com/lessons/row-index-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/row-index-rule/98af34c4c3f80d8341ecbc423cc789c9ad2644a9e2f72fc5c84aefc0a8e396a4.jpgRowindex Sudoku: Reading a row indexA digit in a marked cell tells where that cell’s row number appears in the same column. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/row-index-rule/d4c8137e276093b4734545b7674a0acea751db8ec284feb609fe528deb2ab617.mp4222026-09-28T10:38:48.000Z https://sudoku-sleuth.com/lessons/numbered-rooms-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/numbered-rooms-rule/84a4eb57e749d7b6c48be6842c38eb96137cc13c8e0ec046e506d52f04737cd3.jpgNumbered rooms Sudoku: Counting a numbered roomThe first digit seen from an outside clue gives the position, counted inward, where that clue digit appears. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/numbered-rooms-rule/075e576325ea353d3e87a26c707261a2ea5672f256d8a7fb0580f00db0194dfa.mp4272026-09-28T10:38:51.000Z https://sudoku-sleuth.com/lessons/no-sum-cage-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/no-sum-cage-rule/c0749f2f57abd2c22251c1e2a23b6cb684a5baebb4e0a4f68dfa3b1eaa967294.jpgCage (no sum) Sudoku: What an unnumbered cage meansA dashed cage without a printed total still cannot repeat a digit; it gives no sum. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/no-sum-cage-rule/2e85aea9eae054380cd4603e8f17d3035cf6efa5749b6b2f4349a7b0576d75a2.mp4322026-09-28T10:38:54.000Z https://sudoku-sleuth.com/lessons/unimodular-rule2026-09-28https://sudoku-sleuth.com/lessons/v1/unimodular-rule/9e51c7ac3f1a092adbb9bdc90cc9a9bcffe0f46524b3e21dcbd11f3466ae9999.jpgUnimodular Sudoku: A unimodular line keeps one remainderDigits on a unimodular line all belong to the same modulo-three class: {1,4,7}, {2,5,8}, or {3,6,9}. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/unimodular-rule/7a90a7affc695daafe2d8c0289157533a870538d314435297ad6dc7cf19d42e7.mp4302026-09-28T10:38:58.000Z https://sudoku-sleuth.com/lessons/killer-adding-sums2026-09-28https://sudoku-sleuth.com/lessons/v1/killer-adding-sums/aad2374819f88185808b8dc6c3663dafb241a1168a3bba437851c06601bb5284.jpgKiller Sudoku: add cage sums to find a shared digit setCombine two Killer cage totals to identify four digits, split them between the cages, then use a column clue to finish the deduction.https://sudoku-sleuth.com/lessons/v1/killer-adding-sums/638e1bbfa514d7f470506d34dbb987b950325bad6430748baaefb2937b2eb8ca.mp4522026-09-28T11:15:11.000Z https://sudoku-sleuth.com/lessons/killer-cage-unit-overlap2026-09-28https://sudoku-sleuth.com/lessons/v1/killer-cage-unit-overlap/a0390ff0c3bf5304eec31c3f948ac4d2ed61aadfcfb2e8ff4100fd1be746a26f.jpgKiller Sudoku: Use a box to constrain a crossing Killer cageThis fourteen-cage crosses a box edge. Two of its cells are inside the upper-left box; its third sits outside. The position of nine in that box matters. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/killer-cage-unit-overlap/6020d78850c40e6418581819066529174d88393c557d301a29f7104053202676.mp4532026-09-28T11:15:17.000Z https://sudoku-sleuth.com/lessons/killer-cage-compare2026-09-28https://sudoku-sleuth.com/lessons/v1/killer-cage-compare/863562dfdc138a0e29e54c71ecdfa946458c7973f0580d0097785b9f3219a31e.jpgKiller Sudoku: Compare two Killer cages through their shared rowThese two cages do not overlap. One stays in the top row; the other reaches down into the row below. Their digits can still affect each other. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/killer-cage-compare/1551ce415bfe6262772f8c1c5dcef673200ddabdd3c306ebf8641621442e32d5.mp4372026-09-28T11:15:21.000Z https://sudoku-sleuth.com/lessons/killer-cage-pointing2026-09-28https://sudoku-sleuth.com/lessons/v1/killer-cage-pointing/7f2ff7c4ad068a6c8aa93ad7b6c270a9d6b8f2b11fe95e8830fc052a5d2332ab.jpgKiller Sudoku: Let a Killer cage rule out digits nearbyThis small Killer cage sums to three. We are going to use it on a cell outside the cage, but inside the same Sudoku box. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/killer-cage-pointing/a87d7d4cbff4bff98684cf7142d4c01bc5b85a5d7ef940be972a54348d700285.mp4392026-09-28T11:15:26.000Z https://sudoku-sleuth.com/lessons/killer-derived-sum-combination2026-09-28https://sudoku-sleuth.com/lessons/v1/killer-derived-sum-combination/a7f1ca3ec7d5166b948c1c3349a49c519e29830769057372d686b3631ac8e29a.jpgKiller Sudoku: Use a sum you worked out as an invisible cageThese two Killer cages cover six cells of the top row. Three cells sit outside them, and one of those is an eight. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/killer-derived-sum-combination/da9982702e1c22d585fcf89a1f01bb774c5affbc94a3cb3fdb31a1d5a882f8c8.mp4472026-09-28T11:15:30.000Z https://sudoku-sleuth.com/lessons/killer-class-combination2026-09-28https://sudoku-sleuth.com/lessons/v1/killer-class-combination/4ec36f93531e98c2520eb5b6b0076e0fdf15cd57951ceb15989cc41459de00ee.jpgKiller Sudoku: Use a modular line to choose a Killer cage pairThis fifteen-cage sits on the start of a modular line. Each rule gives us part of the story; together they settle the cage’s two digits. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/killer-class-combination/ee47b33c083a719e72842108555a143dfb96901e2e0f8286f2f2ef8b2a45e2c7.mp4382026-09-28T11:15:34.000Z https://sudoku-sleuth.com/lessons/killer-two-cell-innies2026-09-28https://sudoku-sleuth.com/lessons/v1/killer-two-cell-innies/af717b83536004eb1b6b7d2a0c951bb1ac7e68c3c0be21516a4a2cc537daedc7.jpgKiller Sudoku: Find two missing cells with the rule of 45A row always totals forty-five. These three Killer cages cover seven of its cells, leaving two cells outside. Can their clues tell us what those two contain? Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/killer-two-cell-innies/a8650e2ca494af9d72f1c131bd046a57da388483fbefff7a7583f48e9e6e1ea7.mp4472026-09-28T11:15:39.000Z https://sudoku-sleuth.com/lessons/thermo-bounds2026-09-28https://sudoku-sleuth.com/lessons/v1/thermo-bounds/1d3b24e572686c7b68130287edecfe418fa6b1d8caf4c87f2a2256b0bfea5277.jpgThermo Sudoku: Work inwards from both ends of a thermometerThe bulb is three, and the tip is six. The two cells between them are empty. We can work out both by reading the thermometer from each end. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/thermo-bounds/69552224600cdff7680b625ea76ed38b1a25c9925ff8da4449e0af2536ffdfb4.mp4352026-09-28T11:15:43.000Z https://sudoku-sleuth.com/lessons/thermo-pointing2026-09-28https://sudoku-sleuth.com/lessons/v1/thermo-pointing/9e41c1e656aa0e276470067317626c71c31f76696bbe3eca21799eab72c88503.jpgThermo Sudoku: Reject a thermometer start that empties its boxThis thermometer stays inside the centre box. The two fours outside the box remove four from every cell here except those on the thermometer. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/thermo-pointing/da3bde4e21075b31e5a2478386c84f73333a0383b4d5b7f7f1e44d266b5a176f.mp4342026-09-28T11:15:47.000Z https://sudoku-sleuth.com/lessons/arrow-cage-splitting2026-09-28https://sudoku-sleuth.com/lessons/v1/arrow-cage-splitting/80976e3506c0d9ab8a02d03d79529023350422cfcae0911bfef4bdba35c60193.jpgArrow Sudoku: Subtract an overlapping cage from an arrowThis arrow and this Killer cage overlap. The arrow’s circle is nine. The little cage at the far end of its shaft sums to four. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/arrow-cage-splitting/b31b4a00c3b8cd93021ee0379bf526631b72de535fe7515a570e7ecfa8fe2ddf.mp4342026-09-28T11:15:51.000Z https://sudoku-sleuth.com/lessons/arrow-pointing2026-09-28https://sudoku-sleuth.com/lessons/v1/arrow-pointing/a3e5d879579f43ac6d68054837c4d2346a2359b390b6362177e91d19027805a1.jpgArrow Sudoku: Reject an arrow bulb that empties its boxThis arrow sits almost entirely inside one Sudoku box. The two threes outside the box clear its upper rows, leaving three only in these arrow cells. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/arrow-pointing/d980af080da18264ddb58c866cc5de85ca6d1b700aaba8364d534b1795311d0f.mp4422026-09-28T11:15:56.000Z https://sudoku-sleuth.com/lessons/arrow-452026-09-28https://sudoku-sleuth.com/lessons/v1/arrow-45/7cea3b79fa1a3efd31e5dfa75c625966fb6131ba117f742c213c8923e1aa55c0.jpgArrow Sudoku: Use the rule of 45 to find an arrow circleHere, two Killer cages and an arrow meet in one Sudoku row. The cages cover seven cells; the arrow shaft takes the other two. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/arrow-45/6df70451bcf770f195587086c21ff275a8f48bee453285ff5b443c89175d6369.mp4372026-09-28T11:16:01.000Z https://sudoku-sleuth.com/lessons/pair-arithmetic2026-09-28https://sudoku-sleuth.com/lessons/v1/pair-arithmetic/666a6bd784c74498a992fa018638ff41e72b1328a868c8e78985c98c077002d6.jpgKropki Sudoku: Find the partner across a dot or markerA dot or letter gives the two cells a relationship. The useful question is: which partner can still fit? Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/pair-arithmetic/972a88b64c1ee1341f3cee7ae4247839181e088c2aba17423acb93f251e4dfb2.mp4482026-09-28T11:16:07.000Z https://sudoku-sleuth.com/lessons/marker-chain2026-09-28https://sudoku-sleuth.com/lessons/v1/marker-chain/e68d97a468ba59bb0377738d32f6f6a492ad0be921ede233da79507b6daf0df1.jpgKropki Sudoku: Read two dots togetherOne black dot asks for a double or a half. Here two black dots meet at the same cell, so we need to read them together. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/marker-chain/a69d6beadf61b83d1929a6fe71bebf296cefaa191ed13c522272f61c623ca16f.mp4492026-09-28T11:16:14.000Z https://sudoku-sleuth.com/lessons/marker-sides2026-09-28https://sudoku-sleuth.com/lessons/v1/marker-sides/a2d3c15f84153edf19957f44a7589da8c9eaea5ef2f98fd1f90f96c804c966fb.jpgKropki Sudoku: Carry a Whisper’s side through a black dotThese two green Whisper lines are linked by one black dot. The given one can tell us which side both lines use. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/marker-sides/ab144c5f2b840818542d4aba40b8bc963b0af5dc7cb30b7a73284c6b7c33b0f6.mp4372026-09-28T11:16:20.000Z https://sudoku-sleuth.com/lessons/whisper-marker-colouring2026-09-28https://sudoku-sleuth.com/lessons/v1/whisper-marker-colouring/3216c134624f98d75fe3d2c1c0c208f0c85557c1cb7be4a13355aacf8eab3d11.jpgKropki Sudoku: Let a Whisper choose between dot-chain optionsTwo black dots meet here. Their outer cells also sit at the ends of a short German Whisper. Read both drawings together. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/whisper-marker-colouring/aa9b7cca3c1efc60ce1b6307402f28749fb28a6c5222ba9292e9354537e84c71.mp4382026-09-28T11:16:25.000Z https://sudoku-sleuth.com/lessons/black-chain2026-09-28https://sudoku-sleuth.com/lessons/v1/black-chain/e61846bbe6212b62dd54156d610780a7f05eaa75a555f160f7010a701ade3cef.jpgKropki Sudoku: Follow a chain of black dotsThree black dots join these four cells. Each step doubles or halves a digit. Read the whole chain, not one dot at a time. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/black-chain/12bc68fe5d1117484fb677b610741f163562343520bf414b48dbcc44676e0f75.mp4372026-09-28T11:16:30.000Z https://sudoku-sleuth.com/lessons/dot-parity2026-09-28https://sudoku-sleuth.com/lessons/v1/dot-parity/a2f09ae8aadcd04106075c5015f6c2f0bce27ce9bc56b5b229421051c761505a.jpgKropki Sudoku: Count even digits through V and white dotsTwo V marks and two white dots make four separate pairs in this row. One cell sits outside all four pairs. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/dot-parity/0ca33638aa520ac8952c0831b78ff045db2373ce8ee1d1133552404e026882e9.mp4402026-09-28T11:16:34.000Z https://sudoku-sleuth.com/lessons/dot-pointing2026-09-28https://sudoku-sleuth.com/lessons/v1/dot-pointing/9a60d1680932cb1eaecb988364838d6c38e181c4ce959ec2926629dc9ba7539c.jpgKropki Sudoku: Use a black dot to protect a box’s last oneThis black dot sits inside the top-left box. Let’s use the box to test a candidate on the dot. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/dot-pointing/495c09eac34b680e54dd2adf5cc7c9df0c5a7561319a411064a87b664861de06.mp4392026-09-28T11:16:39.000Z https://sudoku-sleuth.com/lessons/whisper-polarity2026-09-28https://sudoku-sleuth.com/lessons/v1/whisper-polarity/d56b16417ba69879ded887982781a3c2380766ff3df2c845cd09a11d7e7c6fde.jpgGerman whisper Sudoku: Count low and high digits around a Whisper lineA German Whisper jumps at least five between neighbours. That makes each step switch between low digits, one to four, and high digits, six to nine. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/whisper-polarity/e2b91629202a97dc0d9b992ed268e69cf837b7cc711b8668c9f31dca93575c2f.mp4502026-09-28T11:16:43.000Z https://sudoku-sleuth.com/lessons/german-whisper-linked-polarity2026-09-28https://sudoku-sleuth.com/lessons/v1/german-whisper-linked-polarity/732b82e4095f090c4f28110d6361b87c38514320d68833161e3a4ddc428d9eba.jpgGerman whisper Sudoku: Join two Whisper colour patterns where they meetThese are two separate German Whisper lines, meeting at one cell. Each line alternates low and high digits. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/german-whisper-linked-polarity/bb46d6ededbd257bfa5e90076b584d1a209609047940f90e083dd68b2dcd990c.mp4422026-09-28T11:16:46.000Z https://sudoku-sleuth.com/lessons/german-whisper-pointing2026-09-28https://sudoku-sleuth.com/lessons/v1/german-whisper-pointing/e98b5e1b96c291abfe530b9785d1a4baa4c214666f6200ed3de933e7ff11cda9.jpgGerman whisper Sudoku: Test a candidate through meeting Whisper linesTwo German Whisper lines meet here. We know a one at the end of the first, but the far end of the second is empty. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/german-whisper-pointing/d8be23ef37ac98fe5a9fc9f81198c15c5c9e2db483c8275e6758591b634f97a7.mp4392026-09-28T11:16:50.000Z https://sudoku-sleuth.com/lessons/renban-parity2026-09-28https://sudoku-sleuth.com/lessons/v1/renban-parity/dc7d484dab95175ba090c1b29e2b8cc41db2313f09f0323bd317da73a5a61584.jpgRenban Sudoku: Count odd and even digits beside a Renban lineA Renban line holds consecutive digits in any order. On a four-cell line, that always means two odd and two even digits. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/renban-parity/9b3cd2f0ecb62493a295af5b1f21f52c5381964d1d76e8efe78ae6f5a26aeaed.mp4432026-09-28T11:16:54.000Z https://sudoku-sleuth.com/lessons/renban-pointing2026-09-28https://sudoku-sleuth.com/lessons/v1/renban-pointing/5c15f1a392f00e54a56340d1949fb4eea33667cc4ffa0e0ccfcd56cc64316fd3.jpgRenban Sudoku: Reject a Renban digit that leaves its box emptyThis Renban line sits along the bottom of a Sudoku box. The two ones outside remove one from its upper rows. The box must put one somewhere on the line. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/renban-pointing/00906a05cfa8ff8acd87e7f855d8b6f3416a57bbd764f4dd064b90f9d8e8f8bc.mp4362026-09-28T11:16:58.000Z https://sudoku-sleuth.com/lessons/parity-counting2026-09-28https://sudoku-sleuth.com/lessons/v1/parity-counting/48ec1013205cd0cd5bf73e2966324f2c8741f1ca38c0d8bd3e6424a95c93d649.jpgParity line Sudoku: Count the odds to orient a parity lineA parity line alternates odd and even digits. We do not know either end of this line, but the row can tell us how the pattern starts. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/parity-counting/57f5be0f8c3c9659d1229911868f076ca3d00623dd9e0dac0aba13ce4a8a2be0.mp4452026-09-28T11:17:02.000Z https://sudoku-sleuth.com/lessons/parity-line-sides2026-09-28https://sudoku-sleuth.com/lessons/v1/parity-line-sides/bbd0c31112eadfdb25e6b5ef9c822dd3a9e760064a25ee76d2e817f18acfac76.jpgParity line Sudoku: Use an alternating line to claim every even digitAn alternating line can affect cells beyond the line. This one crosses eight cells of a Sudoku row, leaving one cell outside. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/parity-line-sides/201aec1a7b99d3d839209fbc774855c7a884611bac85d55169b393d5af47e71f.mp4392026-09-28T11:17:05.000Z https://sudoku-sleuth.com/lessons/xv-negative-chain2026-09-28https://sudoku-sleuth.com/lessons/v1/xv-negative-chain/55d5e96ee0c407f6951c53f0b7f511f75025055a992d55e4cb2b91894f0d7edf.jpgXV (negative) Sudoku: Let a missing V settle an X chainEvery X and V in this puzzle is shown. That makes an empty edge useful, especially beside a marked pair. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/xv-negative-chain/e5053a5030c0dbb65978ce77a69476bc5e8d40463f26e89fe9d25168b5cf269e.mp4352026-09-28T11:17:08.000Z https://sudoku-sleuth.com/lessons/anti-king-peer-pointing2026-09-28https://sudoku-sleuth.com/lessons/v1/anti-king-peer-pointing/2770fa5b85085795012b34dbe6d9b448d7c2c0d72c36dcd83d8520a683332a92.jpgAnti-king Sudoku: Use an unsettled digit to rule out a nearby cellIn this anti-king puzzle, we do not know where the nine goes in the upper-left box. We can still use it to rule out nine nearby. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/anti-king-peer-pointing/742d2fd4e635df898be40c6040f6e0b8465114df585b2b5ca49bb47cff0ee7f1.mp4432026-09-28T11:17:12.000Z https://sudoku-sleuth.com/lessons/entropic-colouring2026-09-28https://sudoku-sleuth.com/lessons/v1/entropic-colouring/757335a1c4908e9ac97ae7506149d62af33fc3a9c4de60afceb68b4f401729b7.jpgEntropic Sudoku: Use a row quota to colour an entropic lineThis entropic line has four cells. Any three neighbours use one low, one middle and one high digit. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/entropic-colouring/23bb6442d816dbbc1227ee064d5f5088854eeb4afbeb1643bee92d3e2b8eadde.mp4482026-09-28T11:17:17.000Z https://sudoku-sleuth.com/lessons/modular-colouring2026-09-28https://sudoku-sleuth.com/lessons/v1/modular-colouring/cf247cfd85006978c7b38d26c5c612d8bb350802291931f265ef48e9c28e883f.jpgModular Sudoku: Count a modular class across a long lineOn a modular line, each run of three cells uses one digit from each group. A long line lets that pattern repeat. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/modular-colouring/8b2a936808cb1d02e43d59ecf606e42f2f4db70655fe73d964f3f8a1a3561619.mp4532026-09-28T11:17:22.000Z https://sudoku-sleuth.com/lessons/modular-class-choice2026-09-28https://sudoku-sleuth.com/lessons/v1/modular-class-choice/e9808e10786e60ee08ac048e25b3de5385470ba9190125554eac5c405737259c.jpgModular Sudoku: Rule out an impossible modular groupA modular line repeats three digit groups: one-four-seven, two-five-eight and three-six-nine. On this long line, a group appears three times. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/modular-class-choice/4120a40e34744a2ad64290f26faff9ae7752300d935ea9d21b563301944c889e.mp4512026-09-28T11:17:26.000Z https://sudoku-sleuth.com/lessons/class-pointing2026-09-28https://sudoku-sleuth.com/lessons/v1/class-pointing/df187e6591b3a353884a830479f35fce136244d2397af6bf9579ba5f2e052ae9.jpgModular Sudoku: Let a modular line protect the box’s last oneThis modular line crosses the top of a Sudoku box. We can use both rules together, before any digit on the line is solved. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/class-pointing/fdb34205424bd8d2721ee2e2951e6d49529913c8c48d8c3f0a1b82c57ada8f11.mp4382026-09-28T11:17:30.000Z https://sudoku-sleuth.com/lessons/sum-line-pointing2026-09-28https://sudoku-sleuth.com/lessons/v1/sum-line-pointing/33fbb55f52dcab8cf5fd4bdcf3135eefb42b9242f4e1d5254880dc8d2ef16399.jpgRegion sum Sudoku: Reject a line value that empties the next boxThis region sum line crosses a box border. One cell is in the left box; two are in the next. Their segment totals must match. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/sum-line-pointing/5c880f2a1f046e95953c7315e29acaafa28973496b939fb5803ba300048717b6.mp4392026-09-28T11:17:33.000Z https://sudoku-sleuth.com/lessons/region-sum-line-equal-sums2026-09-28https://sudoku-sleuth.com/lessons/v1/region-sum-line-equal-sums/d14a5667fc2e0ab67ab72baed41b65c98811e3858f09c5ad3ca8a49d27523625.jpgRegion sum Sudoku: Use a complete unit to find equal sumsThis region sum line covers an entire row. Box borders divide it into three parts, and all three parts have the same sum. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/region-sum-line-equal-sums/cc11b69fde710c23a62d5e7b158f371a7b2efa834fa478995a7399d4ec0bd2cb.mp4392026-09-28T11:17:36.000Z https://sudoku-sleuth.com/lessons/isotropic-class-colouring2026-09-28https://sudoku-sleuth.com/lessons/v1/isotropic-class-colouring/e93c397b55955b66826692c6f15b692029d3654787d5a578a2dee9e83c564d7a.jpgIsotropic Sudoku: Count a same-class line against its rowAll three cells on this isotropic line use one digit band. We do not yet know whether it is low, middle or high. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/isotropic-class-colouring/4d3e8fe8e9950ac8995167e3dc630de95b94091760e7b3aa23f1605eda05c2f6.mp4402026-09-28T11:17:40.000Z https://sudoku-sleuth.com/lessons/line-choice2026-09-28https://sudoku-sleuth.com/lessons/v1/line-choice/88fc1697e3c34abaec70b3cd7ec9f15f1e77ccf25a5633e507742e0451573107.jpgRenban Sudoku: Discover which rule a line followsThis line follows one of two rules. It could be Renban, a consecutive set, or Nabner, with no consecutive pair at all. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/line-choice/d2b8cf921eaf7074ca5e0e74fb12cce249e2185c7196f0ea26a03e76d758baf8.mp4352026-09-28T11:17:56.000Z https://sudoku-sleuth.com/lessons/classic-naked-single2026-09-28https://sudoku-sleuth.com/lessons/v1/classic-naked-single/e18f812056f92a472e1db15a8a66d6150872530ceab0057cb8c8c666f88b9067.jpgClassic Sudoku: Find a cell with one possible digitA naked single is an empty cell with just one possible digit. Let us inspect the top-left cell. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/classic-naked-single/f93f8bfb963cc37375e5e78b483faf690068f71d5f544dfcb508fbe253fa72c9.mp4392026-09-28T11:18:02.000Z https://sudoku-sleuth.com/lessons/classic-hidden-single2026-09-28https://sudoku-sleuth.com/lessons/v1/classic-hidden-single/8e19a72bd0777e9e94beabc19b15816cb5ca2548dbf55ebe4ba172d2f6b0f41f.jpgClassic Sudoku: Find the only place for a digitA hidden single asks where a digit can go in a row, column or box. We need a one somewhere in this top row. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/classic-hidden-single/ffda616e7512b43b5cc88188346a3fd29e0d6a6cb9f58fee61cf04c67618152d.mp4372026-09-28T11:18:07.000Z https://sudoku-sleuth.com/lessons/classic-hidden-subsets2026-09-28https://sudoku-sleuth.com/lessons/v1/classic-hidden-subsets/a3464c1737e65e19606a8ffcaabdac5257303d010da8e682d0917397aa5f4f13.jpgClassic Sudoku: Find two digits confined to two cellsA hidden pair is two digits that have only the same two places in a row, column or box. The cells may still show other pencil marks. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/classic-hidden-subsets/0c0696912caf263da085934fc02a89e0f926d29eb90cf70119faf5036b7d155e.mp4492026-09-28T11:18:12.000Z https://sudoku-sleuth.com/lessons/classic-naked-subsets2026-09-28https://sudoku-sleuth.com/lessons/v1/classic-naked-subsets/0649340dcbe3a022f3c1163b1756f664cf01993624a8a09ddbe3965f7626b51b.jpgClassic Sudoku: Use a pair of cells to remove candidatesA naked pair is two cells that can hold the same two digits and no others. The pair can remove those digits elsewhere in its row, column or box. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/classic-naked-subsets/92b49cedc393e30067b5c263236b8220fc3bfe1a65bbe6c984da20cd5b506bd5.mp4452026-09-28T11:18:16.000Z https://sudoku-sleuth.com/lessons/classic-naked-triple2026-09-28https://sudoku-sleuth.com/lessons/v1/classic-naked-triple/d0ba8a355d322683bc7b8a85177978fe44b45110cb5ae0a4599fee8c9bd793bc.jpgClassic Sudoku: Reserve three digits across three cellsA naked triple works like a pair, with three cells reserving three digits. Here the first row has five gaps. Watch a worked example, then try the idea in a puzzle.https://sudoku-sleuth.com/lessons/v1/classic-naked-triple/e37b12e007ce8ab1eb41b96882183a89269f45e2945b571ddf73823db5957d80.mp4412026-09-28T11:18:20.000Z https://sudoku-sleuth.com/lessons/classic-set-equivalence2026-09-28https://sudoku-sleuth.com/lessons/v1/classic-set-equivalence/63f38f6d47f7994654d718664c9576a6233a12ac34f359a2c4daeb7cfa0e32d6.jpgClassic Sudoku: Count matching digits in the corners and centre ringThere is a surprising match on a nine-by-nine Sudoku. The four corner blocks and the ring around the centre hold the same collection of digits. 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