SUDOKU
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Sudoku in Skillwik has three levels, pencil notes, hints and a timer. Every puzzle has exactly one solution and your progress saves as you type.
Add to Chrome — free30 stages
Besides the regular levels there is a 30-stage ladder, with a new twist at every step.
How hints work
You start with 3 hints and earn 1 more for every 10 moves, up to 5. A hint names the technique, tints the row, column or box that matters, and can fill the cell for you.
Rules
Fill the 9 by 9 grid so every row, column and 3 by 3 box contains the digits 1 to 9 once.
Frequently asked questions
Does each Sudoku have one solution?
- Yes. The generator checks that each puzzle has exactly one solution before it is shown.