New to Sudoku? Start a small beginner puzzle →
How to play Sudoku
Solve a number puzzle at your own pace with notes, hints, and undo. Choose a small practice grid, a classic 9×9 board, or a larger 16×16 challenge.
- In classic 9×9 Sudoku, fill every row, column, and 3×3 box with the numbers 1 through 9, without repeats.
- Select an empty cell, then choose a number. Given numbers are fixed clues and cannot be changed.
- Turn on Notes to record candidates. Compare the row, column, and box before committing to a value.
A tip for your next game
Look for a row, column, or box with only one missing number. Then look for a number that has only one possible position in a box. Smaller 4×4 and 6×6 boards are useful for practicing this elimination process.
Common questions
When does the daily Sudoku change?
A new daily puzzle begins at 00:00 UTC. An unfinished puzzle retains its original date, so finishing yesterday’s board does not complete today’s challenge.
Are puzzles uniquely solvable?
New puzzles have exactly one solution, including 16×16. Easy puzzles can be solved using single-candidate placements. Other levels aim for fewer clues; their technique difficulty can vary.
Which sizes and difficulty levels can I play?
Choose 4×4, 6×6, 9×9, or 16×16. The 4×4 boards offer Easy and Medium; 6×6 adds Hard; 9×9 and 16×16 also offer Expert.