Anti-Consecutive Sudoku
Orthogonally adjacent cells may not contain consecutive digits
Anti-Consecutive Sudoku is fully playable. Choose a difficulty and start solving.
A global rule with no markings: orthogonal neighbours may never hold consecutive digits. Central digits like 5 are the most hemmed in, so they anchor the solve. Cascading eliminations reward systematic players; skipped updates punish everyone else.
For the complete rules, worked examples and solving techniques, read the full How to Play Anti-Consecutive Sudoku guide.
Like all Sudoku variants, Anti-Consecutive Sudoku builds on the classic 9×9 foundation. Every row, column, and 3×3 box must contain each digit from 1 to 9 exactly once. The variant constraint is added on top of these standard rules, never replacing them.
If you're new to Sudoku, start by learning the basic rules and techniques before attempting variants.
Techniques Useful for This Variant
| Technique | How it applies |
|---|---|
| Pencil Marks / Notes | Essential for tracking candidates alongside the variant constraint |
| Obvious Singles | Cells narrowed to one candidate by the combined constraints |
| Hidden Singles | Digits with only one valid cell in a unit after variant elimination |
| Pairs and Triples | Locked candidates exposed by the additional constraint |