Non-Consecutive Sudoku
No two orthogonally adjacent cells may contain consecutive digits
Non-Consecutive Sudoku is fully playable. Choose a difficulty and start solving.
An invisible, grid-wide rule: side-by-side cells may never hold digits that differ by 1. Each placement instantly bans two values from all four neighbours, so deductions cascade in chains. Few givens are needed, which makes sparse expert grids genuinely demanding.
For the complete rules, worked examples and solving techniques, read the full How to Play Non-Consecutive Sudoku guide.
Like all Sudoku variants, Non-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 |