Sudoku
Fill the 9x9 grid so every row, column and 3x3 box contains 1 to 9 once.
Levels
Easy, Medium, Hard, Expert and Master. Levels are graded by the techniques needed to solve them, not just by how many numbers are given.
Tools
- Notes for pencil-marking candidates (optionally kept correct for you in Settings).
- Hints that name the technique and explain it in words.
- Undo, erase, a number pad that counts down, and pause.
Daily and weekly
The Daily Sudoku is the same grid for everyone, with the level following the weekday. The weekly tournament is one Hard grid per week with a single attempt, no hints and no undo.
Progress is saved in your browser.