Mario & Sonic at the London 2012 Olympic Games (マリオ&ソニック AT ロンドンオリンピック?) is a 2011 sports video game developed by Sega Japan. It was published by Nintendo for Japan and by Sega for North America, Europe, and all other regions. The game is officially licensed by the International Olympic Committee (IOC) through exclusive licensee International Sports Multimedia. It is the third installment in the Mario & Sonic series after the commercial success of its predecessors and is an official video game of the2012 Summer Olympic Games. The game was released on the Wii on November 15, 2011 in North America, November 17, 2011 in Australia, November 18, 2011 in Europe and December 8, 2011 in Japan. It was also released for the Nintendo 3DS in February 2012. The game is the first to come in a yellow keep case instead of a standard white case, similar to how New Super Mario Bros. Wii, was the only game to have a red keep case.
Mario & Sonic on the Wii and 3DS is a collection of numerous events based on the Olympic Games. Players can assume the role of a Mario or Sonic character while competing against the others in these events.