MINESWEEPER.MONSTER

Chording

When a cell is touching the correct number of flags, you can click it to reveal all of its hidden neighbors at once.

Click the 2 to reveal all its hidden neighbours at once
2
1
2
1

Chording is key to playing efficiently. Its name come from the original version of minesweeper, which required you to click both the left and the right mouse buttons to reveal the cells.