DF is my all time favorite game. There have since been many others that use a similar format and some are also great games, but they don't have the same feel and depth, especially with the ability to load your world in adventure mode (dungeon crawler) after your fortress falls... and it WILL fall eventually, but losing it's fun! :D

There's a lot to the game and it can feel overwhelming, but watch a few tutorials and lose a few times.. you'll probably be hooked

Is Dwarf Fortress any good?