A quiet examination hall: rows of empty wooden desks, tall windows down one side, a large clock on the far wall.

⏱️ Contest practice

Ten grids, one hour, scored by the official rules.

Free — preview instantly, sign up free to download

Level

Primary uses 6×6 grids, which we cannot generate yet — secondary only for now.

Scoring

Nothing is marked until you hand it in — the same as the real thing.