About Sudoku
▾
- Category
- Puzzle
- Difficulty
- medium
- Typical session
- ~10 min
The world's favorite logic puzzle across multiple difficulty levels. Fill the 9×9 grid so every row, column and 3×3 box contains the digits 1–9 exactly once.
Play Sudoku free online in your browser — no download, no install and no sign-up. It runs on phones, tablets, laptops and school or work Chromebooks. Sign in only if you want to save your progress and appear on the leaderboard.
How to play Sudoku
- Tap an empty cell, then tap a number to place it.
- Every row, column and 3×3 box must contain 1–9 with no repeats.
- Use notes to pencil in candidates when you're unsure.
- Start with rows or boxes that are nearly complete.
- Fill the whole grid correctly — faster times rank higher.
Sudoku — frequently asked questions
- What are the rules of Sudoku?
- Fill the 9×9 grid so every row, every column and each of the nine 3×3 boxes contains the digits 1 to 9 exactly once. Every puzzle has one unique solution reachable by logic alone — no guessing required.
- How do you solve a Sudoku for beginners?
- Scan for rows, columns or boxes that already hold most digits and fill the forced cell. Then use pencil marks: note every candidate for a cell, and when only one candidate remains, it's confirmed. Start with the digit that appears most often on the board.
- Is Sudoku good for your brain?
- Sudoku is a logic workout that exercises pattern recognition, working memory and concentration. It needs no math — only reasoning about where each digit can go.
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