The Rainbow World
The Rainbow World is the home of the Rainbow Spirits. It was introduced in Return To Wonderland Deluxe Edition and serves as the final world of the Deluxe Levels set. It contains only one level: The End of the Rainbow.
The Rainbow World connects to all worlds through a single gateway in each world with the one in Wonderland being located in the Rainbow Temple in Wondertown. The Rainbow Spirits serve as the guardians and balance keepers of the Rainbow World. If they were to leave, each world connected to the Rainbow World could fall into chaos. Every thousand moons, the Rainbow Spirits leave the Rainbow World, and only a single soul pure of heart can open the gates and return them home and restore balance.
During the events of the Deluxe Levels set, the Rainbow Spirits escape into Wonderland, and Stinky serves as the pure-hearted individual that returns the spirits to the Rainbow World.