Like its previous installments, Mario Kart Wii incorporates playable characters from the Mario series, who participate in kart races on 32 different race tracks using specialized items to hinder opponents or gain advantages. It sold 37. 24 million copies, making it the 9th best selling game of all time, the best selling game of the Mario Kart series, and the 2nd best selling game on the Wii, only behind Wii Sports. The game features multiple single-player and multiplayer game modes including a four-person split screen. Online multiplayer via Nintendo Wi-Fi Connection was available at launch but was discontinued in May 2014, along with other Wii and Nintendo DS games that supported online play.