Mario Circuit 5 is a race course that's new to Mario Kart: Mega Mash-Up. It appears in the Shell Cup.
It is very similar to Wario's Colosseum as the layout of the course and the grid style track you race on reappear however the are several differances. For example, the course is floating outside in the daytime and is a lot more colourful. Also, there are now several Goombas walking around the course which will make you spin out if you come into collision with them. The fire rings have been removed so they are just normal jumps now.
- Goomba - There are multiple Goomba's moving about the board which if the player comes in contact with them, will make the driver spin out.