Difficulty
Left
81
Time
0:00
Top 10
How to play
- Tap a cell, then tap a digit — or move with the arrow keys and press 1–9.
- Every row, every column and every 3 × 3 box must hold 1 to 9 exactly once.
- Tap the digit already in a cell to take it back, or use Erase (Backspace).
- Turn Notes on — or press N — to pencil in candidates instead of an answer.
- Double-click a cell down to its last pencil mark to commit it, and double-click an answer to put it back to a mark. Enter does the same.
- Fill the grid correctly to win. The clock runs from the moment the board is dealt — Pause stops it.
- Easy: about 42 digits given. Each difficulty keeps its own leaderboard.
- A digit that repeats in its row, column or box turns red straight away — a wrong digit that clashes with nothing stays quiet until the end.
- Placing a digit rubs it out of the pencil marks of every cell it rules out.
- Tab steps through the cells you can change and skips the ones you were given.
- Pausing hides the board, so the clock cannot be stopped to think.
- Every puzzle has exactly one solution, so it is always solvable by reasoning — no guessing needed.