Beyblade: Metal Masters (known in Japan as Metal Fight Beyblade: Showdown at the Summit! Big Bang Bladers and previously titled Beyblade: Metal Masters - Nightmare Rex) is the fourth Beyblade video game for the Nintendo DS that is based on the anime, Beyblade: Metal Masters. It was released on December 10, 2010 in Japan and came with the exclusive Nightmare Rex SW145SD. It would later be released internationally on November 15, 2011 and came in five different versions; four of them included with a different Beyblade. The Beyblades were Nightmare Rex SW145SD, Bakushin Susanow 90WF, Vulcan Horuseus 145D, and Ultimate Gravity Destroyer GB145S Stamina Ver.