Sudoku Game Guide
Play Sudoku online
Sudoku is a logic puzzle played on a 9×9 grid divided into nine 3×3 boxes. Your goal is to fill every empty cell with a number from 1 to 9.
Each number can appear only once in every row, once in every column and once in every 3×3 box. Use logic to determine which numbers can fit into the remaining cells.
Choose your Sudoku difficulty
Play Easy, Medium, Hard or Expert Sudoku. Easier puzzles contain more starting numbers, while harder puzzles leave more of the grid for you to solve. You can also play the Daily Sudoku: one puzzle each day with saved progress and streak tracking.
How to play
- Select an empty square.
- Choose a number from 1 to 9.
- Use Notes to keep track of possible numbers.
- Use Erase to clear an editable cell or its notes.
- Complete every cell correctly to solve the puzzle.
Frequently asked questions
How do you play Sudoku?
Fill the 9×9 grid so every row, column and 3×3 box contains the numbers 1 through 9 without repeating a number.
Can I play Sudoku online for free?
Yes. You can play Sudoku on 4ZILLA for free directly in your browser without downloading anything.
Which Sudoku difficulty should I choose?
Start with Easy if you are learning Sudoku. Medium, Hard and Expert progressively give you fewer starting numbers and a more challenging puzzle.
Does this Sudoku work on mobile?
Yes. The Sudoku board and number controls are designed for phones, tablets and desktop computers.
Is there a Daily Sudoku?
Yes. 4ZILLA has one Daily Sudoku puzzle each day, with saved progress and streak tracking.
