Psychonauts

Psychonauts is a trippy and fun game. There are so many different environments you will encounter through the game, and all of them great. No multiplayer and no side-missions makes this game suffer in the replay department, but the single player is too good to pass up. It's colorful, unique, and a breath of fresh air from the many 'gritty' and 'realistic' games. From taming a wild bull to stomping around a city populated by fish, this game is great.