The two franchises meet again to tie in with the 2012 Summer Olympic Games in London. There are 21 playable characters (the same ones as those in Mario & Sonic at the Olympic Winter Games). Over 30 events are featured, including 10 Dream Events and London Party Mode. New events include soccer, badminton, and equestrian, and others have been improved. Dream Events take place in locations from earlier games in both the Mario and Sonic series. The Mii is a playable character, and can be outfitted in unlockable costumes resembling characters from both franchises.

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