sudokly
Sudoku tool

Sudoku Generator

Make a fresh sudoku at any of five difficulty levels. Every puzzle has exactly one solution. Use it once or generate a hundred — it's free either way.

9 by 9 sudoku grid
··4·9·5··
····83·4·
·6····81·
4····2·83
2·19487·5
68·7····4
·28····5·
·5·47····
··3·2·6··
Play this puzzleSee solution
Copy as text
004090500
000083040
060000810
400002083
201948705
680700004
028000050
050470000
003020600

Compact string (0 = empty): 004090500000083040060000810400002083201948705680700004028000050050470000003020600

Medium · 33 clues

814697532572183946369254817497562183231948765685731294728316459156479328943825671
How to use it
  1. Pick a difficulty
    Tap one of the five tabs. Easy is great for beginners; evil is for solvers who finish expert puzzles in their sleep.
  2. Generate
    Tap the orange button to get a new puzzle. Every grid is verified to have one valid answer.
  3. Play or save
    Hit Play interactive to open the puzzle in the full game. Or use the share text to copy the grid as a string.

Generator FAQ

Are these puzzles unique?

Yes. The generator only returns puzzles with exactly one valid solution. Anything else is thrown out before you see it.

How many clues does each difficulty have?

Easy puzzles start with 40–45 numbers. Medium 32–36. Hard 28–31. Expert 25–27. Evil drops to 22–24, near the practical lower limit for logical play.

Can I get the same puzzle twice?

Yes, if you use the same seed. The API accepts ?seed=12345 and returns the same puzzle every time.

Will the same difficulty always feel the same?

Mostly. The clue count is consistent, but a hard puzzle that needs an X-wing can feel harder than one that doesn't, even at the same level.