Interactive Sudoku
Click a cell → type 1–9. Toggle pencil mode for notes.
Difficulty
Easy
Medium
Hard
New Puzzle
Hint
Solve
Check
Clear Notes
Pencil (notes)
Selected:
—
Number pad
Erase (Del)
Undo
Notes:
Unique-solution enforcement may slow puzzle generation on the hardest settings. If a new puzzle takes a few seconds, that's normal.