Extremine is a challenging variation of Minesweeper that forces players to think fast, created by Tommo Zhou for the friendly Ludum Dare 14 competition. The goal of the game is to detonate mines instead of just marking them, and if you don't act fast enough you'll find that the mines will start to box you in as the board shrinks ever faster with each passing second.

The number of usable markers is limited in every game, but you can restore the marker count by unmarking tiles or detonating marked tiles correctly.