From the Super Mario Wiki
Rumble Falls is a stage in Super Smash Bros. Brawl based off the scenery and theme of Donkey Kong Jungle Beat. Like Icicle Mountain from Super Smash Bros. Melee, Rumble Falls scrolls upwards at a continuous rate, meaning characters need to continue to jump from platform to platform to continue going up. Also featured in the stage are ladders which can be climbed and what appear to be stone structures. Located in the background of the arena is a large waterfall, various plant life including vines, and an airplane.
Once the top is reached, and the scenery has gone above the waterfall, the waterfall again starts flowing in the sky taking away the sky background and replacing it with the background of the beginning of the stage, thus repeating the cycle.
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