An anonymous reader writes "id Software has released a port of the classic Wolfenstein FPS to the iPhone. Some of the coding was done by John Carmack himself, who also used original code combined with new code from Wolf3D Redux. The original code was open sourced years ago, and enthusiasts have been updating it, which made the port considerably easier for id. It's available in the iTunes App Store, but the source is available for free at id's website." Carmack also posted a detailed writeup about the decision to bring Wolf3D to the iPhone, including design notes and a few snippets of code. At the end, he says, "I'm going back to Rage for a while, but I do expect Classic Doom to come fairly soon for the iPhone." Kotaku got a chance to try the game at GDC: "It's not just a good reproduction of the original, it seems better."