The Sponge are unlockable wheels only in Mario Kart 7. It has a high acceleration value, but lacks higher values of speed and weight. This article is a stub. You can help Mario Wiki by expanding it. Retrieved from "https://mario.fandom.com/wiki/Sponge?oldid=204095" Categories: Stubs Wheels in Mario Kart 7 Wheels Community content is available under CC-BY-SA unless otherwise noted.