Hanenbow
From Mariopedia, a wiki on Mario, Yoshi, Wario, Donkey Kong, Super Smash Bros., and more!
Electroplankton is a stage in Super Smash Bros. Brawl. This stage is a leafy, swamp-like place. The leaves if stood on too long, or attacked will rock and turn yellow then red.
There are unknown (to date) balls that fly around the stage, bouncing off the leaves and can hit players. There is also water at the bottom of the stage, but it acts like a pit. However it is possible to jump out of the water (a normal jump), but a liquid is harder to jump in than a solid.
To see the stage in action go here [1].
