Sudoku
Fill the grid so every row, column and box has 1 to 9.
About Sudoku
Play free Sudoku online with a fresh puzzle every time. Fill the 9×9 grid so that every row, column and 3×3 box contains the digits 1 to 9 exactly once. Choose Easy, Medium, Hard or Expert, pencil in notes, undo any move and ask for a hint when you're stuck. Every puzzle has exactly one solution.
How to play Sudoku
- Pick a difficulty. The grid starts with some digits already filled in.
- Select an empty square and enter a digit from 1 to 9.
- Each row, each column and each 3×3 box must contain every digit exactly once.
- A wrong digit turns red and counts as a mistake. Fill the whole grid correctly to solve the puzzle.
Controls
- Click / tap a square
- Select it
- 1–9 / number pad
- Fill in a digit
- N / Notes
- Switch to pencil notes
- Backspace / Erase
- Clear a square
- Arrow keys
- Move around the grid
- U / Ctrl+Z · H
- Undo · Hint
Tips and tricks
- Scan each box for a digit that can only go in one square (a hidden single).
- Use notes on harder puzzles: write every candidate, then rule them out as you place digits.
- When two squares in a row can only hold the same two digits, those digits can be removed from the rest of that row.
- Faster solves with fewer mistakes and hints score more points.
Sudoku FAQ
Is this Sudoku free?
Yes. Every Sudoku puzzle is free to play in your browser on desktop, tablet and phone, with no download or sign-up.
Does every Sudoku puzzle have one solution?
Yes. Each puzzle is generated and checked by a solver, so there is exactly one correct way to fill the grid and you never have to guess.
What is the difference between the levels?
Easy and Medium puzzles can be solved by finding the one square a digit fits. Hard has fewer starting digits, and Expert puzzles always need advanced techniques such as candidate pairs.
Is my game saved if I close the page?
Yes. Your current puzzle, notes and time are saved on your device, and you can continue where you left off.
How is the score calculated?
Each level has base points plus a bonus for solving faster than the target time. Every mistake costs 100 points and every hint 250.
- Released
- October 2026
- Made by
- PlayFuzz Originals
- Platforms
- Desktop, mobile, tablet
- Players
- 1