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Arrow keys / WASD on desktop · swipe on mobile · U to undo
Fill every row, column & box with 1–9.
Keys: 1–9 place · ⌫ erase · N notes · arrows move
Sudoku is a logic puzzle played on a 9×9 grid divided into nine 3×3 boxes. Place the digits 1–9 so none repeats in any row, column or box. You never need maths – just careful reasoning.
Fill the 9×9 grid so that every row, every column and every 3×3 box contains each digit from 1 to 9 exactly once. Some digits are given at the start; you work out the rest by logic.
Medium puzzles have 34 starting clues and can be solved with simple single-candidate logic. Hard puzzles have about 28 clues. Tough puzzles have only 24–25 clues and always need techniques beyond singles.
Yes. Every puzzle is generated randomly and checked by a solver, so each one has exactly one valid solution – no guessing required.
When a row, column or 3×3 box has only one empty cell left, the last number is filled in for you automatically. One auto-fill can complete another line or box, so they can cascade.
Yes. Turn on Notes (or press N) to add small candidate numbers to a cell. Notes are cleared automatically when you place that number elsewhere in the same row, column or box.
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