Sudoku
Fresh Sudoku puzzles at four levels, every one with exactly one solution, and a daily puzzle that is the same for everyone. No sign-up and no ads in your way.
How to play
- Fill every row, column and 3 × 3 box with the numbers 1 to 9, each used once.
- Tap a cell, then a number. Turn on Notes to pencil in possible numbers.
- Every puzzle has exactly one solution, so it can always be solved by logic without guessing.
- The daily puzzle is the same for everyone on the same date and difficulty.
How to play Sudoku online
- Pick a difficulty and start a new puzzle or today’s daily puzzle.
- Tap a cell, then a number. Switch on Notes to pencil in candidates.
- Fill every row, column and box with 1 to 9 to solve it.
Features
- Easy, Medium, Hard and Expert
- Every puzzle has one solution
- Daily puzzle by date
- Pencil notes that clear themselves
- Hints, undo and optional mistake check
- Timer, best times and full screen
- Number pad and full keyboard control
Frequently asked questions
Does every puzzle have exactly one solution?
Yes. Each puzzle is made from a random solved grid by removing numbers one at a time, and a removal is kept only if a solver confirms the puzzle still has a single solution. You never need to guess.
What makes Expert harder than Easy?
Easy puzzles have about 38 given numbers and can be solved by finding cells with only one possible number. Medium needs “only place in this row” reasoning too. Hard has about 26 clues, and Expert removes as many as possible and needs techniques beyond the basic singles.
How does the daily puzzle work?
The daily puzzle is built from the date, so everyone who opens it on the same day and difficulty gets the same grid. Your time is saved on your device.
Can I turn off the red mistake marks?
Yes. Untick “Show mistakes as I play” to play without help. If the grid fills up with an error, you are told that something is wrong without showing where.
Is my game saved?
Yes. An unfinished puzzle, with its notes, timer and undo history, is kept in your browser and opens paused next time.
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