Another frequent feature and level type seen throughout the Mario series are stages set high in the sky atop a field of giant mushrooms: some bouncy, some expanding and shrinking, and some stationary.
This stage will be set on an assortment of mushrooms, each one acting as a platform. It will be a medium-sized stage, with at least one bouncy shroom and one that moves up and down.
Potential theme: https://www.youtube.com/watch?v=sKU40Ahiofg
