My favorite is Dwarf Fortress. Slaves to Armok: God of Blood Chapter II: Dwarf Fortress (usually shortened to Dwarf Fortress) is a single-player “ASCII” game (uses letters and other symbols to represent creatures and objects) which includes both a roguelike adventure mode, and the more popular Dwarf Fortress Mode, which focuses on the creation and survival of a small dwarven settlement. More info: http://titifoti.wordpress.com/2013/08/23/dwarf-fortress/