: Your main goal is to navigate through 14 to 20 levels (depending on the version/DLC) to reach a portal at the end of each stage.
While there is no dialogue or explicit prologue, the world-building is handled through environmental interaction:
You control a small, monkey-like creature (sometimes called "Ludwig") who explores a vast, subterranean aquatic world. The "story" is your journey to restore life to this "Undergarden" by spreading pollen to make dormant, bioluminescent flora bloom.
: Along the way, you search for members of a musical band scattered throughout the caves. Bringing these musicians together is your key task as you lead them toward the surface.

