, you must get my profile picture then! Dwarf fortress for the WIN!Dwarf Fortress.
Persevere, get used to the UI and the keyboard shortcuts and prepare to sacrifice many hours. Assuming you like sandbox strategy games.
Personally I grab the Lazy Newb Pack for the graphical overhauls. I find it easier than the ASCII format.
Not to be confused with Cave Story+, which is an enhanced commercial re-release on Steam with additional content.