Rogue, Sentinel, Storm, Thor, and U.S. Agent, while the Capcom side includes Arthur from Ghosts 'n Goblins, Anita from Darkstalkers, Charlie as Shadow from Street Fighter, Devilotte from Cyberbots: Full Metal Madness, Lou from Three Wonders, Michelle Heart from Legendary Wings, Pure & Fur from Adventure Quiz: Capcom World 2, Ton Pooh from Strider, the Unknown Soldier from Forgotten Worlds, and Saki Omokane from Quiz Nanairo Dreams. The roster also contains six secret characters, which are accessed by inputting codes on the character select screen. Most of the secret characters are palette swaps of existing fighters with different moveset properties, such as Shadow Lady, a modified version of Chun-Li. The sole exception to this trend is Roll from the Mega Man series, who has unique sprites, but mostly shares the same moves as Mega Man. Development and release Marvel vs. Capcom: Clash of Super Heroes was originally developed for the CP System II arcade system board. A direct Dreamcast port was revealed by the Computer Entertainment Software Association at the 1998 Tokyo Game Show. The Dreamcast version added the new game mode, Cross Fever, which permitted four-player gameplay. The game later received a PlayStation port. However, the console's RAM limitations required the developer to remove certain features, most notably the game's tag team element; thus, most game modes were restricted to two-character battles, instead of four. This reduced the player's secondary character to an assist role, similar to guest characters. To overcome the limitations, the PlayStation version had to implement a new gameplay mode called Cross Over. Cross Over Mode allows tag team play by forcing the players to fight with identical teams. For example, if Player 1 chooses Spider-Man and Player 2 chooses Ryu, then Ryu and Spider-Man would automatically be selected as Player 1 and Player 2's secondary characters, respectively. The game also added an art gallery, where players could view game art and ending animations. Many frames of animation were also omitted as a result of insufficient RAM, particularly in larger character sprites. Clash of Super Heroes debuted in Japanese and North American arcades in 1998. The game was released on the Dreamcast on March 25, 1999 in Japan, and October 7 in North America. A European version for the Dreamcast, published by Virgin Interactive, was released on June 23, 2000. The game was ported to the PlayStation on November 11, 1999 in Japan, where it was