A little focus goes a long way.
Free online Sudoku. No downloads, no sign-ups. Just you and the next number.
Simple rules. Endless discovery.
Fill each row, column, and 3 × 3 box with the numbers 1 to 9, without repeating a digit. Start with what you know. The next move is closer than you think.
How we make our Sudoku puzzles
We create our puzzle packs with our own Sudoku generator. Starting from a completed grid, it removes clues only when exactly one solution remains. Each puzzle is checked again before joining a pack.
Difficulty follows the logical techniques needed to solve the puzzle, rather than just the number of empty cells. Easy starts with single candidates; higher levels introduce techniques such as pairs, triples, X-Wing, and Swordfish.
Hints that explain the reasoning
Our hints explain the reasoning behind the next move, including candidate eliminations when needed. Use them to understand a pattern and try it yourself on the next puzzle.
Get help when you are stuck ↗