Riverside Circuit is a fast-paced custom track made by Ptpix1. The model was created by Putinas, although Ptpix1 decided to add to it (much like with his previous track, "Piranha Plant Plains"). He decided to do this because he thought the model had potential, but it was a bit too simple. The original model can be seen here. The track includes many grass cuts and a jump across a broken wooden bridge.
v2.0 Time Trial (Dolphin)
Date of release
Completely remade the rainbow section, changing it to a building/cloud section.