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The Best and hardest Dungeon Crawler out there.
Dwarf Fortress is the successor to Slaves to Armok: God of Blood, a hack and slash role-playing game. Dwarf Fortress discards God of Blood's 3D graphics in favor of a text user interface and incorporates economic and strategy modes. On-screen displays utilize slightly modified code page 437 characters in 16 different colors implemented as bitmaps, rendered with OpenGL. This makes the game capable of switching to full screen on Vista, unlike pure text-mode programs. The developer states that graphic representation is not a significant focus.
Pros: Freedom
Open World
Cons: Graphins are not for everyone