1.Fill the grid so each row, column, and 3x3 box contains the numbers 1-9 exactly once.
2.Click a cell and press a number key (1-9) or use the number buttons to fill it in.
3.Use backspace or the Clear button to remove a number.
4.Wrong entries will appear in red and count as mistakes.
Classic Sudoku with a fresh puzzle every session. Pick easy, medium, or hard difficulty, use pencil marks to track candidates, and undo mistakes as you go. Your progress saves automatically in the browser so you can come back later.
Free to play. No download, no signup.
Added May 20, 2025
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