Sudoku
Play classic Sudoku with easy, medium, and hard puzzles. Notes, conflict highlights, and keyboard support.
Difficulty
Board
Fill the grid so every row, column, and box has 1–9
Generating puzzle…
Controls
Keys: 1–9 place, arrows move, Delete erase, N toggle notes
What the tool does
Sudoku lets you play classic 9×9 puzzles with easy, medium, and hard difficulty, plus notes, conflict highlights, and keyboard support.
How to use it
- Pick a difficulty and start a puzzle.
- Fill cells with numbers 1–9 using mouse or keyboard.
- Use notes mode for candidates; watch conflict highlights.
- Complete the board so each row, column, and box has 1–9 once.
Supported formats
- In-browser Sudoku puzzle play (no file import required)
Privacy & security
This tool runs entirely in your browser. Your data never leaves your device — nothing is uploaded to our servers.
FAQs
- Can I take notes?
- Yes. Notes mode lets you pencil in candidate digits.
- Does it check mistakes?
- Conflict highlighting helps spot duplicates in a row, column, or box.
- Is progress saved to an account?
- Play happens locally in your browser session; no account is required.