Mario & Sonic at the Olympic Winter Games[a] is a 2009 sports and party game developed by Sega. Like its predecessor, it was published by Nintendo for Japan and Korea and by Sega in the Western world. The game is officially licensed by the International Olympic Committee (IOC) through exclusive license International Sports Multimedia. The game is the third official crossover title to feature characters from both Mario and Sonic's respective universes, the first and second being the game's predecessor Mario & Sonic at the Olympic Games and Super Smash Bros. Brawl respectively. It was released on the Wii and the Nintendo DS in October 2009, and is the first official video game of the 2010 Winter Olympic Games.
Mario & Sonic on the Wii and DS is a collection of events based on the Olympic Winter Games. Players can assume the role of a Mario or Sonic character while competing against the others in these events. The game features all of the playable characters that were present in its predecessor, as well as four new characters.