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9×9 Sudoku

Every grid is built here in your browser. A digit is only removed while exactly one solution remains, so there is never a point where you have to guess — and never a grid with two right answers.

Best time — no finished grid yet

Time0:00

Empty81

Conflicts0

Givens0

Difficulty

Around 43 givens. A full grid is reachable by scanning alone.

Helpers

Pencil marks Highlight the same digit Flag conflicts as I type

Keys

Move ← ↑ ↓ →

Enter a digit 1–9

Clear the cell Backspace

Pencil marks N

Undo Ctrl+Z

New to Sudoku?

One rule, three ways of applying it, and the scanning habit that finishes your first grid without help.

Read the beginner's guide

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