iPhone plays Doom, but what about Doom 3?

id Software's John Carmack estimates that the iPhone version of iconic first-person shooter Doom took "maybe six weeks of serious work" to come together. Borrowing time -- and an artist -- the prolific programmer managed to assemble a port that, according to a recent VentureBeat interview, "plays great on every iPod Touch and iPhone ever made." But what if he focused effort on the iPhone 3GS, the latest and more powerful variant of Apple's killer app-platform?

"I think we could do the real Xbox Doom 3 game on a 3GS if we targeted it exclusively," Carmack notes. "That is pushing it a bit. You could probably get that kind of visual fidelity." And here we thought portable devices were only good for recording spooky audio logs and unlocking doors within exploding barrel research laboratories.

This article was originally published on Joystiq.