Sudoku

What Is Sudoku?

Sudoku is a number placement puzzle played on a 9x9 grid split into nine 3x3 boxes. Starting from a partially filled board, the goal is to fill every empty cell so each row, column, and box contains the digits 1 through 9 with no repeats.

How to Play

• Select an empty cell, then tap a number on the keypad or type it on your keyboard
• Every row, column, and 3x3 box must end up containing 1 through 9 exactly once
• Use Check at any time to see whether your current entries are correct
• Given starting numbers are locked and cannot be changed

Strategy Tips

• Scan rows, columns, and boxes for numbers that can only fit in one remaining cell
• Work on the box with the most given numbers first, since it has the fewest options left
• Use pencil-in logic in your head: note which numbers are already ruled out before guessing
• If you get stuck, step back and look for a different row or box rather than guessing randomly

Frequently Asked Questions

What are the rules of Sudoku?

Fill the 9x9 grid so every row, every column, and each of the nine 3x3 boxes contains the digits 1 through 9 exactly once.

How do I enter numbers?

Click or tap an empty cell to select it, then choose a number from the keypad below the board or type a digit on your keyboard.

What do the difficulty levels change?

Easy, Medium, and Hard change how many starting numbers are already filled in, with fewer given numbers making Hard puzzles more challenging.

What happens if I enter a wrong number?

The cell turns red and your mistake counter goes up, but you can keep playing and correct it at any time before finishing.

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