A little puzzle, just for you.
Pick a size, tap a cell and fill in the numbers. Your progress stays in this browser.
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3
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1
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2
A gentle start
On a keyboard: arrow keys to move, numbers to fill, Backspace to erase, Ctrl or ⌘ + Z to undo.
How these puzzles are made
Each puzzle is generated in your browser from a random seed. Clues are removed one at a time, and a clue only stays removed if the puzzle can still be solved with simple logic.
A second, exhaustive solver then proves there is exactly one solution. No guessing is ever needed.
In 4 × 4 puzzles each row, column and 2 × 2 box holds 1 to 4. In 6 × 6 puzzles each box is two rows by three columns and holds 1 to 6.
Want the classic 9 × 9?
The SUDORI app has endless 9 × 9 puzzles in six difficulties, the full Coach, notes, variants and your companions.
- Coming soon toApp Store
- Coming soon toGoogle Play