Tap Tap Revenge Trivia (iPhone)
The game was originally called Tap Tap Revolution and was developed by Nate True. He managed to create it before Apple released the official SDK, as he and a team of hackers found a way to reverse engineer the device's security and got the game to work on a jailbroken phone.
A new start-up Tapulous, Inc. bought the game and hired him to maintain it. They released it in the iTunes Apps Store for free.
The game is written in straight Cocoa and all its graphics are rendered in software on the CPU, without using the phone's graphic chip.