The case notes
How the non-consecutive rule works
Orthogonally adjacent cells cannot hold consecutive digits. Watch a worked example, then try the idea in a puzzle.
Put it into practice
No consecutive neighbours
Non-consecutive Sudoku keeps the usual rules, then adds one: cells sharing an edge cannot hold neighbouring numbers.
5 bars 4 and 6 next door
The centre cell is five. Look directly above it. Four and six are one away from five, so neither belongs there.
Four side-sharing cells
The same check reaches left, right and below. All four cells touching a side of the five lose both four and six.
Diagonals do not count
This diagonal cell does not share an edge. The non-consecutive rule alone does not remove four or six from it.
Edges, not corners
Check cells that touch along an edge. Consecutive digits cannot sit there; diagonal pairs are outside this rule.
Read the transcript
Non-consecutive Sudoku keeps the usual rules, then adds one: cells sharing an edge cannot hold neighbouring numbers. The centre cell is five. Look directly above it. Four and six are one away from five, so neither belongs there. The same check reaches left, right and below. All four cells touching a side of the five lose both four and six. This diagonal cell does not share an edge. The non-consecutive rule alone does not remove four or six from it. Check cells that touch along an edge. Consecutive digits cannot sit there; diagonal pairs are outside this rule.
