माइनस्वीपर.

Best times are saved in this browser. Some boards may still need a guess.

Mines are placed after the first click, away from that cell and its neighbours, so the first click always opens an area; empty cells open their neighbours automatically.

Beginner is 9 × 9 with 10 mines, intermediate 16 × 16 with 40 and expert 30 × 16 with 99.