Jigsaw Sudoku
Irregular jigsaw-shaped regions replace the standard 3×3 boxes
Jigsaw Sudoku is fully playable. Choose a difficulty and start solving.
Nine snaking, colour-coded regions stand in for the 3×3 boxes; rows and columns behave as always. Region shapes that stretch across many lines produce eliminations a square box never could. Expect a brief adjustment period, then roughly classic difficulty with fresh geometry.
For the complete rules, worked examples and solving techniques, read the full How to Play Jigsaw Sudoku guide.
Like all Sudoku variants, Jigsaw 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 |