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Jigsaw Sudoku (Irregular)
Learn Jigsaw Sudoku, also called Irregular Sudoku: the 3×3 boxes are replaced by irregular jigsaw-shaped regions that each contain 1–9.
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Jigsaw Sudoku, also called Irregular or Squiggly Sudoku, keeps the row and column rules but throws away the neat 3×3 boxes. In their place are nine irregular, interlocking regions, each of which must still contain 1 to 9 exactly once.
The wandering region shapes break the visual habits you build on classic boards, so scanning feels fresh even to experienced solvers. The same logic techniques apply; they just play out across unfamiliar geometry.
To Playoku’s engine a jigsaw region is just another kind of unit, so the variant plays with the full experience here: notes, mistake-checking and undo, on freshly generated boards with a single solution.
Rules
- Every row contains 1–9 once.
- Every column contains 1–9 once.
- Each irregular region contains 1–9 once (instead of square boxes).
Frequently asked questions
What is Jigsaw Sudoku?
A Sudoku where the 3×3 boxes are replaced by irregular, jigsaw-shaped regions. Rows and columns work exactly as in classic Sudoku.
Is Jigsaw Sudoku harder?
The unfamiliar region shapes make patterns harder to spot, so many solvers find it a step up — but the underlying logic is the same.
Explore more Sudoku
Try another variant, play the classic game, or sharpen up with the strategy guides.
Play classic Sudoku free →