Mario Kart 8 is a racing game developed primarily by Nintendo EAD, with Namco Bandai Holdings assisting, for the Wii U. It is the eighth installment in the main Mario Kart series (hence the game's name) and, including the arcade games, the eleventh overall. This installment is the follow-up game to the Nintendo 3DS title Mario Kart 7. Like other Nintendo 3DS and Wii U games, this game can be purchased both physically at retail and digitally through the Nintendo eShop, with the digital version requiring 4949.8 MB (approx. 4.83 GB) of memory to be installed. The game was released on the last three days of May 2014 worldwide.