The Bathtub Karts are a group of karts in Kart Kingdom, you get the Red Bathtub Kart when you complete the Kart Kingdom Tutorial. They are some of the most popular karts, and New users wear them a lot. They are easy to make too. The red bathtub kart is one of the first karts you get in Kart Kingdom, and they have been in Kart Kingdom since the first day. Very rarely though they are even used in Kart Kingdom trends.