Sudoku

Fill each row, column, and 3 × 3 box with 1–9. Find your own pace.

20 offline practice puzzles per difficulty. New games favor unfinished puzzles in this round. Each puzzle saves separately; after a full round, start again. Completion records include games with reveals and stay in this browser.

Arrow keys to move · 1–9 to enter · Backspace to erase · N for notes. Time counts only while this page is visible and not paused, even when the timer is hidden. Mistakes are counted and marked, and never end the game. Mistakes and hints stay counted after undo.