The Mario & Sonic series is a crossover series staring Mario & Sonic the Hedgehog from Sega. His launch title was released in 2008 with Mario & Sonic at the Olympic Games for the Beijing 2008 Olympics. The second game from the series is at the 2010 Olympics Winter Games in Vancouver. The two games are can be played from one to up to four players at one time and features Wi-Fi capability.
Originally, Mario & Sonic at the Olympic Games was considered an April Fools Joke as the game was revealed late March. Soon after, Sega stated on their official website that the game is official, and that both Sega and Nintendo are working on this game project.