Sudoku
About Sudoku
Fill every row, column and box with 1–9. Three difficulties, notes, and a fresh daily grid shared with every player.
Sudoku is a logic puzzle on a nine by nine grid. Fill every row, every column and every three by three box with the numbers 1 to 9, each exactly once. There is no maths involved, only careful reasoning, and every twzl grid has exactly one solution.
Tips
- Start with the rows, columns and boxes that are nearly full: a box with seven numbers has only two left to place, and often only one place for each.
- Scan one number at a time. Pick a 5, look at every box that lacks one, and ask where a 5 can still go.
- Use notes. Pencil the candidates into the squares you are unsure of, then clear them as you place numbers.
- When two squares in a box can only hold the same two numbers, those numbers are spoken for, and can be removed from every other square in that box.
- If you are stuck, look for a square with only one candidate left rather than guessing: a good Sudoku never needs a guess.
Questions
- Is it free?
- Yes. Every puzzle on twzl is free to play in your browser, with no download and no account needed.
- Is there a new Sudoku every day?
- Yes. A fresh grid appears each day at midnight, and everyone gets the same one, so you can compare times with friends and on the leaderboard.
- Can I play yesterday's puzzle?
- Yes. Every past daily grid is in the archive, one tap from the game.
- How hard is it?
- There are three levels. Easy suits a first try, and hard needs the pairs and candidate techniques above.
- Does it save my progress?
- Yes. Your grid is saved as you go, and it follows you to another device if you add an email to your account.
