Dwarf Fortress (or, rather, "Slaves to Armok: God of Blood Chapter II: Dwarf Fortress") is a labor of love spanning nearly two decades. You take command of a generational colony of fantasy miners living in a mountain. Construct new mines, dig new tunnels, and keep your dwarves whistling while they work. And then wait for it to all go wrong.
Dwarf Fortress is known for its incredible complexity and difficulty, where a single mistake can lead to tragedy. Tunneling too greedily and too deep can, for example, accidentally flood your dwarves' home when you hit some groundwater.
Famously unfinished and without an actual winning condition, each game is guaranteed to eventually collapse into spectacular failure. Fortunately, the game seems to embrace its own glorious absurdity. With a release date of "time is subjective" and features like "Now with graphics!" the game's Steam page seems to know exactly what it's doing. Especially intriguing are two new game modes that may give a little more shape to this endless experience.