Later time spent developing the Doom port would disprove this belief, and now Carmack feels comfortable doing a Quake port with "two joysticks" if need be. But initially, he couldn't look to other developers for cues on how to make controls work for the FPS genre. "Everyone would show me 3-D controlled games, and they were universally bad," he says.

Now, the possibility of seeing classic FPS offerings on the iPhone is very real. There are still several titles in Carmack's back catalogue he'd like to see ported to the iPhone. "Doom II RPG probably is next on the agenda," he reveals, and after that, Quake would likely get its iPhone port. Ideally, id Software is looking to release ports in chronological order, with one exception. A Rage-themed game built from scratch is also something Carmack would like to see developed to tie-in with the release of the console and computer versions of Rage.

, a futuristic first person shooter and racing game to be released on the Mac, PC, and console platforms, has still not been given a set release date. Yet, after it is released, Carmack expects to go back to one of the most storied franchises in gaming history and work on Doom 4.