How Jigsaw Sudoku Puzzles Work
Jigsaw sudoku is sudoku with the boxes cut into interlocking shapes. The rows and columns behave exactly as you expect, but the nine 3×3 blocks are replaced by nine irregular regions that wander across the grid. This guide covers the goal, the rules that keep every board solvable by logic, the extra technique that irregular regions unlock, and where to try one in your browser.
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