A fresh grid, every time.

Yes. The engine rejects any grid with a second solution and any grid that needs guessing.

Difficulty is rated by the hardest human technique required, not by how many clues are left. Easy uses singles. Medium adds pairs, triples, and pointing. Hard needs X-Wing or Y-Wing.

Yes. Download PNG or PDF in US Letter or A4. Switch to Answer key for the filled grid, with the original clues still bold.

Yes. Sign in for five free generations, or create unlimited puzzles with Plus. Choose Save to keep a puzzle in your account, then submit it for review. Approved submissions appear in the Plus Sudoku library. Save and Download use no generation credits.