sudokly

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
6·4··95··
··8··5·2·
··58····7
247·8···9
96·····53
8···9·742
5····73··
·3·6··2··
··23··9·5
Play this puzzleSee solution
Copy as text
604009500
008005020
005800007
247080009
960000053
800090742
500007300
030600200
002300905

Compact string (0 = empty): 604009500008005020005800007247080009960000053800090742500007300030600200002300905

Medium · 34 clues

674219538198735426325864197247583619961472853853196742516927384439658271782341965

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.