Endless

I have a lot of respect for those people who have done huge virtual works for videogames, mods for example. I think it is something with a certain complexity and difficulty that requires time and patience, but that done with passion can become something fantastic. Mods that have become complete games (Killing Floor, Counter-Strike, DoTA) I certainly think it is an admirable job of these people who feel so much passion for a game, that improve it to how they can or just add fun things.