Narrowing Down

**Sudoku, Diagonals, Thermometers, Quadruples** -Standard 9x9 sudoku: The digits 1 through 9 appear in every row, column, and box without repetition. - Diagonals: Digits may not repeat along either of the marked long diagonals. - Thermometers: Digits along thermometers strictly increase as you move away from the bulb. - Quadruples: Digits in a quadruples circle must appear at least once in the four cells surrounding the quadruple. Subscribe to our mailing list to receive a weekly email with all of our puzzles from the previous week: https://missingdeck.net/mailing.html