Fill every row, column, and 3×3 box with the numbers 1–9. Each number can only appear once in each row, column, and box.
How do I start?
Tap any empty cell to select it, then tap a number below the grid to fill it in. Use Notes mode to pencil in possibilities before committing.
FAQ
Is there a new puzzle every day?
Yes — tap the Daily button for today's puzzle. Everyone in the world gets the same daily puzzle, and your streak tracks how many days in a row you complete it.
What do the difficulty levels mean?
Beginner gives you the most starting numbers and is great for newcomers. Expert removes the most cells and requires advanced techniques like X-wing and swordfish.
What is Notes mode?
Notes (pencil marks) let you write small candidate numbers inside a cell without committing. Tap the Notes button, then tap numbers to toggle them. Tap Notes again to switch back to normal input.
How many mistakes am I allowed?
3 mistakes end the game. The mistake counter at the top tracks how many incorrect numbers you've placed.
Does my progress save?
Your daily streak and best times are saved in your browser automatically — no account needed.