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Play Sudoku — Free Online Easy, Medium and Hard Sudoku

Place the numbers 1 to 9 so every row, column and box is complete.

YoHU Sudoku is the classic number puzzle played on a 9×9 grid. You place the numbers 1 to 9 in the empty squares; each number can appear only once in every row, every column and every bold-lined 3×3 box. The puzzle is solved when the grid is completely filled.

A new puzzle is generated for every game and each puzzle has exactly one solution. Easy starts with 58 numbers filled in, Medium with 32 and Hard mostly with 26. There are helpers like pencil notes, hints and undo; an unfinished game is saved, so you can pick up where you left off any time.

Play now

Single player · opens in your browser

How to play

  1. 1Click 'Play now', press PLAY and choose Easy, Medium or Hard.
  2. 2Tap a square, then pick a number from the buttons below. On a computer, the 1-9 and arrow keys on the keyboard work too.
  3. 3With the input mode button you can switch to number-first mode: pick a number, then tap each square where you want to place it.
  4. 4Turn on the Notes button to write small candidate numbers in a square; X clears the selected square and Undo reverses your last move.

Rules

  • Every row, every column and every 3×3 box must contain each number from 1 to 9 exactly once.
  • You can't place a number that's already in the same row, column or box; conflicting squares turn red.
  • You can earn up to 6,000 points on Easy, 12,000 on Medium and 18,000 on Hard; every second that passes costs 10 points.
  • Each hint costs 150 points on Easy, 300 on Medium and 450 on Hard; auto-notes halve your score, and using the solver or playing without a timer sets it to zero. The best score for each level is stored in this browser.

Strategy tips

Start with the fullest rows, columns and boxes; where few numbers are missing, the right one is quickly clear.
Pick a number and scan the grid: in a box where it's missing, rule out rows and columns to find the single square that fits.
On hard puzzles use pencil notes; when a square is down to one candidate, the number is certain.
The small number in the corner of each number button shows how many of that number are left; a number that has been placed nine times is dimmed.

Frequently asked questions

Is sudoku free?

Yes, completely free; no download or sign-up needed.

Will the puzzles run out?

No. A new puzzle is generated for every new game and checked to have a single solution.

Is my unfinished game saved?

Yes. The grid, your notes and your time are stored in this browser; use Continue on the level screen to pick up where you left off. One unfinished game is stored at a time.

Does my score go on the leaderboard?

No. The best score for each level is stored in this browser; it's not linked to a YoHU account or the leaderboard.