Sudoku Variant 7: Jigsaw Sudoku

Welcome to Jigsaw Sudoku! Standard rows and columns remain, but the 3×3 boxes are replaced by irregularly-shaped colored regions of 9 cells each. Every region must contain digits 1–9. These curvy shapes break your habitual scanning patterns!

🧩 Jigsaw Sudoku — Irregular Regions

💡 Colored regions replace 3×3 boxes. Each region = 9 cells with digits 1–9, no repeats.

00:00

# What Is Jigsaw Sudoku? Irregular regions replace 3×3 boxes. The Law of Leftovers is a powerful Jigsaw technique: cells "left over" when a row crosses a region boundary must contain the same set as cells "left over" outside.

Tags: jigsaw sudoku, irregular sudoku, nonomino, sudoku variants, free sudoku