Play · Solo
Sudoku
Nine rows, nine columns, no clock breathing down your neck. Pick a difficulty, take your time, and let the grid make sense.
EasyPuzzle 1 / 40
00:00
Ready when you are.
The clock starts as soon as you press start. Nothing is sent anywhere — the board lives in this browser.
Filled 42 / 81
Difficulty
Settles with single candidates and one-digit-per-unit logic.
Choosing a difficulty always deals a fresh puzzle.
Hints used: 0
Keyboard
- 1 – 9Place a digit
- Shift + 1 – 9Add or remove a note
- 0 · BackspaceClear the cell
- ArrowsMove around the grid
- NSwitch notes on and off
- SpacePause and resume
About this board: Every puzzle here was made on this playground: a complete grid is solved, numbers are removed one at a time, and each step is checked so the puzzle keeps exactly one solution. That same solution is what the hint button reveals — so a hint is never a guess.
- 140 puzzles across four tiers — 40 easy, 40 medium, 40 hard, 20 hell
- Every board is verified to have exactly one solution
- Progress is kept in this browser only: no account, no server