When Rainbow Road appears, you can win extra sweet boosters!

Complete a level without losing a life to win and progress on Rainbow Road. The more levels you complete in a row, the more boosters you collect – so keep up that streak to win big!
There are up to 5 tiers of rewards that you can achieve. The boosters won will appear automatically on the board at the next level.
If you lose a life or quit the level, you will drop one step back on Rainbow Road. But you can always bring it back up!