A special collector"s edition of Doom III Xbox will launch this March alongside the regular version, and features ports of PC classics Ultimate Doom and Doom II with split-screen multiplayer options, according to retailers. Doom III for the Xbox will launch in the US this March 1st in regular and collector"s edition sets, according to online retailers EB Games and GameStop, and retail sources in the UK speaking to Eurogamer this lunchtime have indicated that the situation will be much the same here.