Gaming's most prominent mascots square off again to commemorate the 30th Olympiad with competitions across nine disciplines in Mario & Sonic at the London 2012 Olympic Games. More than a dozen series mainstays join the titular duo, from Luigi and Knuckles to Bowser and Dr. Eggman, as they compete in athletics, aquatics and gymnastics-themed activities. Certain events make special use of the 3DS, requiring gamers to blow into the microphone to breathe while swimming, swipe their stylus on the touchscreen during a race, or tilting the handheld during the balance beam event.