Rainbow Run is the first level of World Star in Super Mario 3D World.
Features[]
The main features of the Rainbow Run is running across rainbow-colored platforms. It may be based on Rainbow Road, a recurring course in the Mario Kart series. In the background of this level, the music playing happens to be an arrangement of the Ground Theme.
Green Stars[]
- Green Star 1: The first Green Star can be found by going through a Warp Pipe near spinning rainbow platforms. The player must use the Super Bell in order to get up there. After getting through the Warp Pipe, the player must navigate the two green balls to their switches to get the Green Star.
- Green Star 2: A Fire Flower is needed to get this next Green Star. After riding Plessie, there is an area with two unlit torches. After the player lights them using the fire form, a Cloud Cannon appears and will shoot them to the next area. The player must then run across all of the platforms, fully revealing that the platform resembles Link's sprite from The Legend of Zelda as well as causing the Green Star to appear.
- Green Star 3: After the Checkpoint Flag, the player must hop through the Green Star Ring and collect all eight of the Green Star Coins to make the Green Star appear.
Stamp[]

The stamp can be found during the area while riding Plessie. It is to the very right, near some coins.