Sudoku
Classic 9×9 sudoku — relaxed, with a hint that teaches.
How to play
- Fill the grid so every row, column and 3×3 box contains 1 to 9, with no repeats.
- Tap a cell, then tap a number — or use your keyboard. Tap Notes to pencil in candidates.
- Repeated numbers in a row, column or box are highlighted gently — there is no game over.
- Stuck? The Hint highlights a cell and explains the logic, so you learn the technique.
What it trains
- Trains concentration, working memory and step-by-step logical deduction
- Calm by default — no timer, no pressure, no account
- The teaching hint builds your solving skill instead of just giving answers
Play classic 9×9 sudoku free online: fill the grid so every row, column and 3×3 box holds 1–9. Four difficulties from easy to expert, every puzzle with a single logical solution. Relaxed by default — no ads, no account, no timer, no game over — with pencil marks, large-print mode and a hint that explains the next move instead of filling it in. Plays on phone and desktop.
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