Worms

Worms ($4.99)

Team 17 Software's long-running Worms franchise hit the App Store just about a month after the announcement of the iPhone 3GS. As such, it didn't ship with any fancy graphical features. They are coming, though.

Team 17 is working on an update that will bring a much prettier-looking game to those with newer devices including visuals like water refractions, advanced particle effects, and the bouncy, animated backgrounds--all things that have come from the PlayStation 3 version of the game. You can see the differences in what that will look like in the screenshot to the left. The shot on top is the game running on an iPhone 3G, while the one on the bottom is on a 3GS.

Until the update comes out, the existing version has a low graphics mode that users can pick, which helps the game run on older hardware.