Mario Kart DSNow you can play Mario Kart against opponents all over the world with Mario Kart DS. Mario Kart DS includes new tracks, as well as retro tracks selected from all the previous Mario Kart versions. In addition to a handful of single player modes, you can play with up to eight players locally or with four players over the Internet. Your records are stored in your cartridge, and a unique friend code lets you keep track of friends online.