Dwarf Fortress is a management sim where you take control of a group of dwarves and attempt to create of settlement out in the wilderness. The graphics are simple but the game is incredibly complex and once you get a handle on the way the game works, very rewarding to play.
In a succession game, a group of people take turns heading up the fortress, handing off the reins at the end of each in-game year.
To do this, the game files are transferred to the next person on the list and everyone goes around until war, famine, spiraling bad moods or FORGOTTEN BEASTS FROM DEEP BENEATH THE SURFACE OF THE EARTH kill all of the dwarves.
If you've never played dwarf fortress and have no idea what this is about, you should read the most famous Dwarf Fortress succession game:
Boatmurdered
(http://orig03.deviantart.net/4980/f/2008/254/c/3/the_fall_of_koganusan_by_majicxiii.jpg)
http://lparchive.org/Dwarf-Fortress-Boatmurdered/Introduction/
Here's the link, give it a look and if this sounds like fun to some people, throw your hats in in this thread.
Resources:
LNP Pack, to make the game easier to run and easier on the eyes.
http://lazynewbpack.com/
My First Fortress Tutorial
http://dwarffortresswiki.org/index.php/DF2014:Quickstart_guide