The first official update to the series was Street Fighter II': Champion Edition, pronounced Street Fighter II Dash in Japan, as noted by the prime notation on the logo. In this game, players can play as the four computer-controlled boss characters and two players can choose the same character, leaving one character with an alternate color pattern. The game also features slightly improved graphics, including differently colored backgrounds and refined gameplay. A second upgrade, titled Street Fighter II' Turbo: Hyper Fighting, called Street Fighter II Dash Turbo in Japan, was produced in response to the various bootleg editions of the game. Hyper Fighting offers faster gameplay than its predecessors, different character costume colors, and new special techniques. Super Street Fighter II: The New Challengers, the third revision, gives the game a complete graphical and musical overhaul and introduces four new playable characters. It is also the first game for Capcom's CP System II arcade hardware. The fifth arcade installment, Super Street Fighter II Turbo, Super Street Fighter II X in Japan, brings back the faster gameplay of Hyper Fighting, a new type of special techniques known as "Super Combos", and a hidden character, Akuma.