Free Sudoku Online

Free sudoku for your phone, tablet or computer: four levels from Easy to Expert, every puzzle with exactly one answer, notes, hints that say why, and a new daily sudoku puzzle every day. No download, no sign-up.

Play Sudoku

Levels: Easy, Medium, Hard and Expert
Every day: A daily puzzle, Easy on Monday to Expert on Sunday
Mistakes: Classic (3 allowed), Relaxed or Off
Cost: Free: Sudoku never costs coins

Our sudoku

Fill the 9×9 grid so every row, every column and every 3×3 box holds the numbers 1 to 9 once each. Every puzzle has exactly one answer, and each is graded by the techniques a person needs to solve it, not just by how many numbers it starts with: an Easy grid falls to simple singles, while Expert asks for patterns like the X-Wing. The solving techniques, step by step, are in our guide to sudoku rules and techniques. Each level also has a page of its own with tips: easy sudoku, hard sudoku and expert sudoku.

How to play

Place: tap a cell, then a number. Or tap a number first and then every cell it goes in; all cells with that number light up, so gaps are easy to spot.
Notes: turn on Notes to pencil small candidates into a cell. With Auto-clear notes on, a number you place clears itself from the notes in its row, column and box.
Fix: Erase empties a cell and Undo takes back any move.
Keyboard: on a computer, arrow keys move, 1 to 9 place, Backspace erases, N turns notes on and off and H asks for a hint.

The daily sudoku puzzle

Tap Daily for today's puzzle, the same for everyone. The week climbs: Easy on Monday, Medium on Tuesday, Wednesday and Friday, Hard on Thursday and Saturday, and Expert on Sunday. Solve it for a crown on the calendar, keep a streak going, and go back to any day you missed.

Mistakes your way

In Settings, choose how mistakes work. Classic turns a wrong number red, and three mistakes end the game; after the third you can take a Second chance and carry on. Relaxed still shows wrong numbers but has no limit, and Off checks nothing, so you find your own mistakes like on paper. Highlight lines lights up the row, column and box of the cell you pick.

Hints that explain

Hint fills one cell and tells you in a short sentence why that number goes there, so it teaches instead of just giving answers. You get 3 free in every puzzle, and a free bonus gives more. Fewer mistakes and hints earn more stars when you finish. Statistics keeps your wins, best and average times, perfect games and streaks for each level.

Tips

Start with the number that already appears most often on the grid: it has the fewest places left.
Use notes on Hard and Expert, and keep them tidy with auto-clear on.
When a hint names a technique, look for the same pattern elsewhere before you ask again.

Questions

Is this sudoku free?

Yes. It runs in your browser with no download and no sign-up, and Sudoku never costs coins.

Which level should I start with?

Easy if you are new to sudoku, Medium if you already solve newspaper puzzles. Hard and Expert need notes and a few techniques.

Do I ever need to guess?

No. Every puzzle has one answer that logic alone can reach, so there is always a next step to find.

Is my game saved?

Yes, on your device as you play, so you can close the page and tap Continue later. With a free account your progress follows you to your other devices.

Can I play on a phone and on a computer?

Yes: iPhone, Android, tablets and computers. On a phone or tablet, pick Portrait or Landscape on the home screen.