This game mainly involves the management of a fortress of Dwarves in the hope that you'll survive another year and not get overrun by the Goblins.
Oh, and it's ASCII.
Mike: Well, I was playing Dwarf Fortress, my fort died.
Greg: Whadda fuck is Dwarf Fortress? Sounds shit...
Mike: No, it's awesome, it's ASCII!
Mike: FALCOOOON PUUUUUUNCH!!!