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?
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