Jigsaw Sudoku Online
Same rules as classic — except the nine boxes become irregular nine-cell regions. Pick a tier and start solving.
Jigsaw Sudoku — also called Geometric or Squiggly Sudoku — is the 9×9 variant that swaps the standard 3×3 boxes for nine irregularly shaped regions. Each region still contains nine cells and must hold the digits 1–9 exactly once, just like the classic boxes; the row and column rules don't change. The catch is that the irregular shapes invalidate every reflex built on the 3×3 grid: pointing pairs, box-line reductions, and box-shaped naked subsets all need re-tuning to the new region outline shown by the heavier borders on the board. Sudoku247Online generates a fresh region map plus a uniquely solvable puzzle on every play, so no two jigsaw puzzles ever look the same. Start with Easy to retrain your eye on the region shapes, then push into Medium and Hard once you're scanning irregular regions as fluently as 3×3 boxes.