Box Brain Sudoku
Rules › Jigsaw
How to play Jigsaw sudoku
Jigsaw sudoku, also called irregular sudoku, keeps the rows and columns but replaces the nine square boxes with nine odd shapes.
Boxes become shapes.
The rules
- Rows and columns hold 1 to 9 once each.
- The thick-edged shapes replace the 3×3 boxes. Each shape holds 1 to 9 once.
Where to start
- Where a shape pokes into a row, it can force where that row's digits go.
- Every row and every shape adds up to 45, so when a few rows together almost match a set of whole shapes, the cells sticking out must balance the cells left over.
Play Jigsaw in Box Brain Sudoku
Every Jigsaw puzzle in the app has exactly one solution and can be solved by logic alone, from Easy to Expert. Stuck? A hint first nudges you towards the right area, then names the technique and shows the move.