The great game developer Double Fine has released an app for the App Store, and it's related to their very popular game Psychonauts (which recently arrived on the Mac App Store itself), but it's not, unfortunately, a port of the game. The Psychonauts Vault Viewer is instead sort of an ancillary add-on to the title, a compendium of all of the game's "memory vault" animations, along with new commentary from the game's creators Scott Campbell and Tim Schafer. It's interesting but if you've never played Psychonauts, you probably won't find a lot of enjoyment in the app itself. If you love the game, the app is like an extras DVD, with lots of game content and some other features.
Vault Viewer is a free universal app, available now on the App Store. We've seen quite a few game companies use Apple's platform in this way, creating ancillary apps to their main games, and making use of the mobile platforms as a sort of a "second screen" for players either while they're playing or for a game on another platform. I wouldn't be surprised to eventually see a full iOS game from Double Fine, but for now, this is what we've got.