Play free Sudoku online: fill the 9x9 grid so every row, column and 3x3 box holds 1 to 9, from easy puzzles up to extreme ones.
About Sudoku
Sudoku is the number puzzle everyone knows: a 9x9 grid split into nine 3x3 boxes, with a few numbers already filled in. Your job is to fill the rest so that every row, every column and every box contains the numbers 1 to 9 exactly once.
This browser version is made by InfinityGames, a small studio from Portugal. It is the calm opposite of Geometry Dash: there is no spike waiting for a mistimed jump, just logic, and you can take as long as you like on each grid.
Difficulty Levels and Daily Challenges
The menu offers four levels: Easy, Medium, Hard and Extreme. Easy grids start with many numbers filled in, so you can solve them by scanning rows and boxes. Extreme grids give you far fewer starting numbers and usually need notes to finish.
Daily Challenges give you one new puzzle for every day of the calendar. Finish every day of a month and you earn that month's trophy, which goes into the Trophy Room.
How to Play Sudoku
- Choose a difficulty from the menu, or open Daily Challenges.
- Select an empty cell.
- Enter the number that fits its row, column and box.
- Keep going until the whole grid is solved.
Controls
- Mouse or touch: select cells and numbers.
- Number keys: type a number into the selected cell.
- Notes: switch to note mode to pencil in the numbers a cell could still be.
- Undo, Erase and Hint: take back a move, clear a cell, or reveal one correct number.
Mistakes, Settings and Stats
A game allows 3 mistakes. A wrong number is marked straight away, so you know when to rethink a row. In Settings you can turn off the mistakes check and the limit, highlight duplicate or identical numbers, have notes filled in at the start, and play in Shapes mode, where shapes take the place of digits. The Statistics screen keeps your games played, wins, win rate, wins without mistakes, best time and average time.
Tips
- Start with the rows, columns or boxes that are nearly full.
- Use notes to keep track of the numbers a cell could still be.
- If a number can only go in one cell of a box, it goes there.
- Save hints for Hard and Extreme grids, where one revealed number can open up a whole box.
