More of a toy than a game, but a very cool toy nonetheless. Aims to model a zombie outbreak where you can tweak all the little parameters and even individually control one of the hapless NPCs about to be devoured. You can even design your own structures to be used in mapgen, call in the military, or wipe the slate clean with a nuke. I just like watching all the NPCs flock around though. Looks really good too, has a lovely aesthetic best described as "government-contractor-core".