Mario Kart game to include online play via the Nintendo Wi-Fi Connection. It went on to become the best selling handheld racing game of all time, selling 7.83 million units. The game marks the debut of tracks appearing in previous games. Mario Kart Wii was released for the Wii in 2008 and incorporates motion controls and 12-player racing. Like Mario Kart DS, it includes online play; it allows racers to play as user-created Miis (after unlocking the Mii character) as well as Mario series characters and comes packaged with the Wii Wheel peripheral, which can act as the game's primary control mechanism when coupled with a Wii Remote. Mario Kart Wii went on to be the worldwide best-selling game of 2008. Mario Kart 7 for the Nintendo 3DS was released in 2011, which features racing on land, sea, and air. Mario Kart 7 added the ability to customize the kart and to race in first-person mode. Three Mario Kart arcade games have been released, Mario Kart Arcade GP in 2005, Mario Kart Arcade GP 2 in 2007, and Mario Kart Arcade GP DX in 2013. All of them were developed jointly by Nintendo and Namco and feature Namco characters including Pac-Man and Blinky. The most recent entry in the series is Mario Kart 8 for the Wii U, which was released at the end of May 2014, which brings back gliders and propellers from Mario Kart 7 as well as 12-player racing in Mario Kart Wii. Mario Kart 8 includes a new feature called Mario Kart TV, where players can watch highlights of previous races and uploading them to YouTube. Another new feature is anti-gravity racing, where players can race on walls and ceilings. An enhanced port, Mario Kart 8 Deluxe, was released on the Nintendo Switch on April 28, 2017. The game keeps most elements from the Wii U version, while adding more characters, kart parts, battle modes, and battle stages. The port received universal critical acclaim, and has sold over 20 million copies as of August 2020, becoming the best selling game for the console. As the series has progressed, many aspects included in Super Mario Kart have been developed and altered. The power-up boxes which are flat against the track in Super Mario Kart due to the technical limitations of the SNES became floating boxes in later games. The roster of racers has expanded in recent games