"DS" is the first "Mario Kart" game ever to have computer opponents in battle mode. In battle mode, up to eight carts have four balloons and battle each other until one wins. Another change is that players start with one balloon and must blow into the microphone to blow up other balloons. With fewer balloons, players get better items, but run the risk of getting knocked out early. With more balloons, they are safer, but get items that are not as good.