On June 10, 1992, the Super Nintendo Entertainment System released Street Fighter II, a video game that became a cultural phenomenon and significantly influenced the gaming industry for years. The release was widely covered by the press, highlighting its potential to reshape the video game landscape. The game played a major role in the rivalry between Sega and Nintendo during the early 1990s, though the competition between their consoles was not solely based on Street Fighter II. The Sega Mega Drive had its own fighting games, such as Streets of Rage and Streets of Rage 2, while the Super Nintendo had exclusive rights to Street Fighter II at first. In March 1993, Sega and Capcom announced a partnership during an event at the Sofitel hotel in Redwood City, California. Tom Kalinske of Sega of America and Joe Morici of Capcom USA revealed that Street Fighter II would be the first Capcom development for the Mega Drive, accompanied by a six-button controller. The exclusivity of Street Fighter II on the Super Nintendo was temporary, and the Mega Drive received a version of Street Fighter II Champion Edition, which included four additional characters, raising the number of playable fighters to 12. The initial development of Street Fighter II Champion Edition for the Mega Drive was handled by an external studio but was later taken over by Capcom, resulting in the release of Street Fighter II' Special Champion Edition. The game was released on a 24 Mbits cartridge, a new record at the time. However, the release date was delayed to September 1993 due to challenges in adapting the game for the Mega Drive's hardware. The Mega Drive version of Street Fighter II was compared to the Super Nintendo version in several aspects, including color, details, and gameplay responsiveness. Some environments showed the Mega Drive version to be more detailed, such as Ryu's level with a crescent moon in the night sky. However, the Super Nintendo version was noted for richer details in other areas. The Mega Drive version featured more metallic and crackling digitized voices, and the musical arrangements differed due to the sound chips of each console. The handling of the game was also different, with the six-button controller being recommended for the Mega Drive. The unintentional combo mechanism called CPS1 Chain was present only on the Mega Drive, which favored its fidelity to the original arcade version. The base game of Street Fighter II on the Super Nintendo sold 6.3 million copies, with additional sales for Street Fighter II Turbo and Super Street Fighter II, totaling over 12 million cartridges sold. In contrast, the Mega Drive version of Street Fighter II' Special Champion Edition sold 1.65 million copies. Despite the lower sales, the Mega Drive version remains the only Capcom game on the console to exceed the million sales mark.