Choose a difficulty
Start with Easy or select a level that suits you.
SUDOKU GUIDE
Rules and how to play
Learn the rules in a few minutes and start training your mind.
Objective and rules
Fill the 9 × 9 grid with numbers from 1 to 9 so that:
- Every row contains 1–9 with no repeated number.
- Every column contains 1–9 with no repeated number.
- Every 3 × 3 box contains 1–9 with no repeated number.
GET STARTED
How to play, step by step
Select a cell
Select the empty cell you want to fill on the Sudoku board.
Enter a number
Choose 1–9 from the number pad or your device keyboard.
Correct mistakes
A wrong move turns red; choose another number. The game ends after 3 mistakes.
Complete the puzzle
Correctly fill all 81 cells to complete the game and record your score.
TOOLS
Helpful tools
Undo
Return to your most recent move.
Erase
Clear the number in the selected cell.
Notes
Record possible numbers before making a decision.
Hint
Reveal the correct number for the selected cell, up to 10 times per game.
SCORING
How is your score calculated?
Every game starts at 0. Correct moves earn base points by difficulty plus one of 10 speed-bonus levels. The full bonus applies within 50% of the target time, then drops by 10% for each additional 25%, reaching zero after 275%. Each cell earns points only once.
PROFILE
Guest and User accounts
Guests can choose a name and play immediately. Register or sign in to transfer Guest progress, sync achievements, and manage a User profile.
Tips for beginners
- Start with a row, column, or 3 × 3 box that has only a few empty cells.
- Use Notes when a cell has multiple possibilities.
- Do not guess too quickly—eliminate numbers by row, column, and box.
Ready for a challenge?
Choose a suitable difficulty and start a new Sudoku game.
Play now