Notoriously Unknown
Quick, somebody come up with a witty response!
Spore is the obviouse choice for me. It has online compatibilty so you can chat with people, but it also has a stellar single player thing too. I could spend years making spore animal/creature/things...
Other than that, though, I think I would go with Scribblenauts once it's released. Can we chose a game that's not out yet?
Other than that, though, I think I would go with Scribblenauts once it's released. Can we chose a game that's not out yet?