Much like Flat Zone 2, Hanenbow is a stage that takes place in a completely 2D environment. There are three “trees,” a dominant one just right of center, one sticking down from an invisible ceiling in the top left corner, and then one with a single leaf in the bottom left corner. The brown stems, however, are merely background–you can’t land on one, nor does it function as a wall. The eleven leaves provide the only platforms in this stage, all of them passable. Also, unlike all other stages in Brawl, the water at the bottom of this stage cannot be swam in–characters in the water will continue to plummet into the bottomless pit for a KO. There is no texture detail in the stage, and the background is an almost solid green, the water solid blue. There are also bubbles floating in the background.
The leaf platforms are all interactive, though. As they get hit, they tilt upward, and the further they’re tilted, the more they change color, until they’re completely red. Also, Hanenbow plankton repeatedly come up out of the water hitting the leaves, and as they connect with the leaves, they make musical notes depending on the positioning and color of the leaves. (The Hanenbow make no contact with characters, though, and constitute no hazard.) As such, the only background music in this stage is the ambience that goes along with the musical notes being repeatedly struck by the Hanenbow. For this reason, it is the only stage in Brawl with no entry under My Music. Note that if one turns all the leaves on the righthand tree red, then a flower will sprout at the top of the tree, and this incidentally is how to clear Solo Event 28, which takes place on this stage.
The Hanenbow stage is taken from the DS game Electroplankton, and is an interactive music game, allowing the player to create their own music. One of the ten “stages,” or interfaces, in the game is Hanenbow, where very similarly to the Brawl stage, the player uses the stylus to manipulate the leaves and the Hanenbow to make different sounds. One can turn the leaves from green to yellow to orange and finally to red. Also, just like in Brawl, turning all the leaves red on a tree causes a flower to bloom at its top.