Item description:

Slaves to Armok: God of Blood, Chapter II: Dwarf Fortress, also called Slaves to Armok II: Dwarf Fortress, but most commonly known simply as Dwarf Fortress, is a freeware video game by Bay 12 Games for Microsoft Windows, Linux, and Mac OS X set in a high fantasy universe that combines aspects of roguelike and city-building games and is primarily known for its unique level of complexity and difficulty. The title of the game is inspired by its primary focus on the construction, management, and exploration of dwarven fortresses within the game world. Development started in October 2002, followed by the game's first public release in August 2006.