Classic logic puzzle - Fill the grid with 1-9
Fill the 9x9 grid so that each row, column, and 3x3 box contains all digits from 1 to 9 without repetition.
Sudoku is a logic-based number placement puzzle that became a global phenomenon in the 2000s. Despite its association with numbers, Sudoku is purely a logic puzzle - no math is required. The numbers could be replaced with letters or symbols without changing the puzzle.
Each puzzle has a unique solution that can be reached through logical deduction. The modern Sudoku format was popularized in Japan in the 1980s (the name means "single number" in Japanese), though similar puzzles existed earlier in French newspapers.
Our free online Sudoku offers three difficulty levels, each generated with a guaranteed unique solution. Features like pencil marks, undo, and error highlighting make it perfect for both beginners learning the ropes and experienced solvers chasing their best times.
Play Sudoku daily to improve your logical thinking, pattern recognition, and concentration. Track your progress with personal best times for each difficulty level!