ThePuzzleLabs

Jigsaw Sudoku

Hard

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Play Hard Jigsaw Sudoku — ThePuzzleLabs

Try this Hard Jigsaw Sudoku puzzle on ThePuzzleLabs.

00:00
Classic

How to Play

Fill the 9×9 grid so every row, column, and irregular region contains digits 1–9. Regions are shown by color and thick borders.

👆

Click a cell to select it, then press a number 1–9 to place it.

🧩

Unlike standard Sudoku, regions are irregular shapes instead of 3×3 boxes. Each colored region must contain digits 1–9 exactly once.

✏️

Toggle Notes mode (N key) to pencil in candidates.

🔴

Conflicts are highlighted in red. A cell conflicts when the same digit appears in its row, column, or region.

💡

Use up to 3 hints. Each hint reveals a cell's value and explains the logic.

Keyboard shortcuts
Place digit1–9
EraseDelete
Notes modeN
NavigateArrow keys
Undo
Ctrl+Z
Redo
Ctrl+Y

Solve This Puzzle?

This will fill in the complete solution. The puzzle will be marked as “solved with reveal” rather than self-solved.

About hard jigsaw sudoku

Hard jigsaw sudoku introduces the techniques that make this variant interesting. Naked and hidden pairs become necessary, and you'll encounter situations where the Law of Leftovers gives you information that no standard technique can provide. When a region overlaps a band of rows, the digits spilling out match the digits spilling in from other regions. Learning to spot these overlaps is the key to breaking open stalled hard puzzles. Expect solve times roughly 30% longer than hard standard sudoku.

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