A recently-surfaced rumor has suggested that a Mario Kart 8 demo will be available for Wii U owners. The unconfirmed demo will apparently launch in the Nintendo eShop and is said to contain more than three tracks. Nintendo has yet to announce whether it will release a demo of the upcoming racing title via its online marketplace. Mario Kart 8 is also rumored to feature a Grand Prix mode that supports up to four players. The full game arrives May 30 in stores and in the eShop.