From the Super Mario Wiki
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This stage is a leafy, swamp-like place. The leaves will rock and turn yellow, then red, if attacked; attacking the leaves also creates various tones that blend with the stage's ambient background music. In Super Smash Bros. Brawl, players cannot add any music to the stage, not even through the My Music mode (as Hanenbow does not appear in "My Music", even after being unlocked), likely because the ambiance and tones would interfere with it. In Super Smash Bros. Ultimate, as with Summit, Duck Hunt, PictoChat 2, Living Room, Balloon Fight, Tomodachi Life, Find Mii, Wrecking Crew, Pilotwings, and Wuhu Island, any music track available in the "Others" playlist can be selected to play on this stage, including the background ambiance, as well as a new remix made for the stage.
There are Hanenbow that fly around the stage bouncing off the leaves, and can hit players that end up in their path. There is also water at the bottom of the stage, which is treated as a pit unlike unlike any other instance of water. Players are also rendered as 2-D, similar to the stages Flat Zone, Flat Zone 2, and Flat Zone X. This is one of three stages in Brawl to have its own icon (a Nanocarp) without having a playable character to go alongside it, the others being Smashville and PictoChat.
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Super Smash Bros. Brawl stickers
Super Smash Bros. Ultimate spirit
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