Sudoku Online Free – Classic 9×9 Grid
Sudoku Online Free is a classic 9×9 number puzzle: each row, column, and 3×3 box must contain digits 1–9 once. Click a cell, type or tap a number, check your board, then generate a fresh puzzle.
About this game
Clues are fixed when the puzzle loads; empty cells accept 1–9 from the keyboard or on-screen buttons. Conflicts highlight in red. Check validates against the solution; clearing a full correct board awards a win and score. Press R or NEW for another generated grid.
Controls
| Player | Keys |
|---|---|
| Player | Click a cell, then 1–9 (keyboard or buttons) to enter a digit |
| Player | Arrows move selection · Backspace/0 clears · Enter/C checks · R or NEW regenerates |
Common use cases
- Train logic with a full 9×9 sudoku when you want a quiet browser puzzle.
- Practice spotting row, column, and box conflicts before checking.
Tips
- Fill obvious singles in a box before guessing across the whole board.
- Use CHK after a block of entries so conflicts surface early.
- Arrow keys move the selection without lifting your hands from digits.
FAQ
How do I win Sudoku Online Free?
Fill every empty cell so each row, column, and 3×3 box holds digits 1–9 exactly once with no conflicts.
What do the CHK and CLR buttons do?
CHK verifies your entries against the puzzle solution; CLR clears the selected empty cell.
Can I get a new board without reloading the page?
Yes. Press R or click NEW to generate another 9×9 puzzle with a new clue pattern.
Are the given clue numbers editable?
No. Starting clues stay locked; only blank cells accept your digits.
Is this sudoku free to play in the browser?
Yes. Sudoku Online Free runs in your browser with no download or account.