Dwarf Fortress

Dwarf Fortress is a single-player fantasy game. You can control a dwarven outpost or an adventurer in a randomly generated, persistent world.

Although Dwarf Fortress is still in a work in progress, many features have already been implemented.

The world is randomly generated with distinct civilizations, dozens of towns, hundreds of caves and regions with various wildlife.
The world persists as long as you like, over many games, recording history and tracking changes.
Command your dwarves as they search for wealth in the mountain.
Craft treasures and furniture from many materials and improve these objects with precious metals, jewels and more.
Defend yourself against attacks from hostile civilizations, the wilderness and the depths.
Support the nobility as they make demands of your populace.
Keep your dwarves happy and read their thoughts as they work and relax.
Build floodgates to divert water for farming or to drown your adversaries.
Much much more...
Play an adventurer and explore, quest for glory or seek vengeance.
Meet adversaries from previous games.
Recruit people in towns to come with you on your journey.
Explore the world without cumbersome plot restrictions.
Accept quests from the town and civilization leaders.
Retire and meet your old characters, then reactivate them again.
Z coordinate allows you to move seamlessly between dungeon levels and scale pyramids fighting adversaries above and below.
The combat model uses skills, body parts, wrestling, charging and dodging between squares, bleeding, pain, nausea, and much more.
A dynamic weather model tracks wind, humidity and air masses to create fronts, clouds, rain storms and blizzards.
Extended ASCII character set rendered in 16 colors (including black) as well as 8 background colors (including black).