Sudoku
📖 Sudoku About
Sudoku is the classic number-placement puzzle. You try to fill every row, column, and box from one to nine. Free in the browser.
About Sudoku
The board is a nine-by-nine grid split into nine three-by-three boxes. There's only one rule: every row, every column, and every box must contain each number from one to nine exactly once.
The puzzle needs no arithmetic; it's built entirely on elimination logic. Figuring out which number can't go in a cell is usually easier than figuring out which one can.
Why do kids love this game?
Since you can pick the difficulty, every age finds a starting point that fits. It builds logic rather than number skill.
Is this game safe for kids?
Yes. It's built entirely around numbers and logic, with no violence or disturbing content.
🎯 How to Play
- Choose a difficulty level.
- Tap an empty cell.
- Enter a number from one to nine.
- Don't repeat a number in the same row.
- Don't repeat it in the same column either.
- Don't repeat it in the same three-by-three box.
- Fill every cell to finish.
⌨️ Controls
💻 PC
WASD
Move
SPACE
Action / Jump
📱 Mobile
👆
Tap & drag
💡 Tips & Tricks
- Start with elimination: figuring out which number can't go in a cell is usually easier than figuring out which one can
- Check the full rows: rows and boxes that are seven or eight cells full solve the fastest, so start there
- Take notes: when a cell has more than one candidate, jotting them all down makes later elimination easier
- Don't guess: entering a number without being sure makes it harder to find your mistake, so leave it blank unless you're certain
- Start easy: before raising the difficulty, it helps to lock in your elimination logic on the easy level
⚡ Features
- Classic nine-by-nine: the familiar sudoku board layout
- Difficulty selection: different levels from easy to hard
- Note-taking: mark more than one candidate on a cell
- Error checking: wrong placements get flagged
- No time pressure: think for as long as you like
- Works everywhere: played with mouse or touch controls
❓ Frequently Asked Questions
Yes, the game is completely free. There's no download or sign-up required — open the page in your browser, the board loads, and you can start playing right away with nothing more than an up-to-date browser.
No, not at all. Sudoku involves no addition or subtraction; it's built entirely on elimination logic. The numbers just act as nine symbols that are easy to tell apart from one another.
Every row, every column, and every three-by-three box must contain each number from one to nine exactly once. That single rule is the entire puzzle, and there's no other restriction to worry about.
With rows, columns, and boxes that are already seven or eight cells full. Finding the missing number there is much easier, and every cell you fill helps solve the neighboring regions too.
It suits kids eight and up. It's built entirely around numbers and logic, and the difficulty level can be adjusted, with no blood or disturbing content since the whole thing runs on simple mechanics.
