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Sudoku Online: six difficulty levels and eight ways to play
Classic sudoku from Easy to Extreme, plus Killer, Jigsaw, Sudoku X, mini and giant grids, and four daily puzzles.
Sudoku Online is free sudoku in your browser. Fill the grid so that every row, column and box holds each number once. That is the whole rule, and it is enough for a lifetime of puzzles.
Six difficulty levels
Easy, Medium, Hard, Expert, Master and Extreme. Easy puzzles start with about 42 numbers filled in, and Extreme with about 22.
Eight ways to play
- Classic 9 by 9 sudoku
- Daily Sudoku: four new puzzles a day, the same for everyone
- Killer Sudoku, Jigsaw Sudoku and Sudoku X
- Mini Sudoku on a 6 by 6 grid
- Sudoku for Kids on a 4 by 4 grid
- Giant 16 by 16 sudoku
Tools that help
- Notes, to pencil in the numbers a square might be
- Hints that fill in a square when you are stuck
- Undo, and a mistakes check that turns wrong numbers red
- A timer, board themes, music and keyboard shortcuts
Stuck on a puzzle from somewhere else?
The built-in Sudoku Solver can solve it for you, and the strategy guide explains the techniques that move you up the difficulty levels.
