Mushroomy Kingdom is a stage. It is a starting stage in Ultimate Company Smackdown. It originates from the Mario series, and is Mario's home stage.
Mushroomy Kingdom is based off of the first two levels of Super Mario Bros., Worlds 1-1 and 1-2. The platforms are the main feature carried into the stage, as the enemies have all disappeared.
Mushroomy Kingdom has two different layouts, and each have a 50% chance of loading. However, holding A while selecting the stage will always generate World 1-1, and holding B while selecting the stage will always generate World 1-2. Both layouts will scroll slowly.
World 1-1 is a desert stage with no life. There are sandy Brick Blocks, as well as ? Blocks that hold items once struck. They can be struck by hitting the bottom with one's body, or using an attack. An item will come out of ? Blocks once struck. There is a staircase made from Brick Blocks, as well as a flagpole and small castle. Warp Pipes will serve as platforms.
World 1-2 is a cave stage that slightly resembles a maze. The ceiling is undeniably low; some up throws will KO at 0%. There are many different patterns of Brick Blocks. There is one Warp Pipe at the end that can be used as a platform.