On phones: tap the FULLSCREEN button for a pure full-screen game. On desktop: click the game once if keys don't respond.
Play Sudoku — Free Online
Play Sudoku free in your browser. A modern 9×9 logic puzzle with Easy, Medium and Hard levels, smart conflict highlighting, timer, and dark mode
How to Play Sudoku
The objective is to complete the whole grid so that every row, every column, and every 3×3 box contains the digits 1 through 9 exactly once. A few digits are printed in the grid before the game starts; these givens are locked and form the clues from which the rest of the puzzle is deduced. There is no arithmetic involved and no order in which cells must be filled — the game is pure pattern logic, playable at any pace. When the final digit is placed correctly, the board completes, a celebration animation plays, and your finishing time is recorded.
The Three Rules
Every placement must satisfy three rules at the same time. If a digit already appears in a row, column, or box, it cannot be placed there again:
1. Rows: each of the nine horizontal rows must contain the digits 1–9 with no repeats.
2. Columns: each of the nine vertical columns must contain the digits 1–9 with no repeats.
3. Boxes: each of the nine 3×3 boxes must contain the digits 1–9 with no repeats.
That is the entire rulebook. All sudoku strategies, from beginner scanning to advanced elimination, are just organised ways of testing these three rules against the clues.
