Tap any empty cell to select it. The selected cell is highlighted in blue, and its row, column, and 3×3 box are lightly shaded.
Use the number pad at the bottom to enter a digit (1-9). Each row, column, and 3×3 box must contain each digit exactly once.
Toggle ✏️ Note mode to pencil in candidates. Use 💡 Hint for help. Press ⌫ to erase. Complete the puzzle to win!
Q: How do I play Sudoku?
A: Fill the 9×9 grid so each row, column, and 3×3 box contains digits 1-9 exactly once. Use logic, not guessing!
Q: What are the pencil marks for?
A: Toggle ✏️ Note mode to write small candidate numbers in empty cells. This helps you track possibilities without committing.
Q: Can I get hints?
A: Yes! Select a cell and press 💡 to reveal the correct number. One hint per puzzle.
Play free Sudoku puzzles online with 5 difficulty levels — Beginner, Easy, Medium, Hard, and Expert. Features smart cell highlighting, pencil marks (note mode), hint system, undo, mistake counter, and game timer. Clean mobile-friendly design works on phone, tablet, and desktop. Daily brain training, logic puzzles, number games. No download or sign-up required — play sudoku instantly in your browser.