Sudoku

Seven levels from Easy to Evil. Every puzzle has exactly one solution.

Daily Sudoku

One puzzle per level, the same for everyone. Your time goes on the leaderboard.

Mistakes 0　

Every puzzle has exactly one solution (all levels except Evil are generated fresh each time). Close the page anytime; open the same level to continue.

See full rankings →

See rankings →Daily Sudoku →Printable Sudoku →Large Print Sudoku →4x4 Sudoku →6x6 Sudoku →Sudoku strategies →

How to play

1. Pick a level

Choose one of seven levels from Easy to Evil. You get a new puzzle each time.

2. Fill in numbers

Tap a cell, then a number. Each row, column and 3x3 box must contain 1 to 9 exactly once.

3. Complete the grid

Use Notes to pencil in candidates. Wrong numbers turn red.

Full rules and how to play →

Difficulty levels

Level	Given numbers	What it takes
Easy	40	Fill cells that have only one possible number
Medium	32–33	Same technique, fewer clues, more searching
Hard	26–28	Use notes; pairs and pointing at most
Expert	26 or fewer	Basics always stall; pairs or pointing required
Master	28 or fewer	Pairs stall; X-Wing or XY-Wing required
Extreme	26 or fewer	Even X-Wing stalls
Evil	26 or fewer	The Extreme puzzles that need the deepest reasoning. The hardest level

FAQ

Is it free?

Yes. All seven levels are free. No sign-up.

Does every puzzle have one solution?

Yes. Each puzzle is checked by the program to have exactly one solution.

Will I lose my progress if I leave?

No. Open the same level on the same device and browser to continue. One game is saved per level.

Are there ads?

We never interrupt you with ads while you're solving a puzzle.

Can I play on my phone?

Yes. No install needed. On a computer you can also use number keys, arrow keys and N to toggle notes.

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