Siliconera: PSP owners, don’t feel left out because Lost Heroes is for the 3DS. Namco Bandai is making a crossover game with Gundam, Ultraman, and Kamen Rider for PSP too. Great Battle Full Blast is a different kind of game, though; it’s an action game. You start by picking three heroes out of this list: Freedom Gundam, Gundam, Kamen Rider Decade, Kamen Rider #1, Ultraman or Ultra Mebius.
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Great Battle Fullblast, a PSP brawler that brings together Gundam, Ultraman, and Kamen Rider characters has a few "familiar" bosses. Tyrant (not the one from Resident Evil), a space alien from the Ultraman universe, is one of the bosses you have to defeat.