Described as a "trippy visual journey of self destruction," E4 will enable you to play with your own tunes -- or, according to the peoplespeak of Q's press release, "wiz ur muzik" -- and against others in an online versus mode. If you're hooked on the PSP version (and if not, do get hooked), you'll know that the gameplay is all about chain reactions. Pretty chain reactions. But this XBLA version also offers Leaderboards and Achievements to keep the chain junkies flying. When, you ask? "Later this year."