 The game does not explicitly have a story , but has a narrative line that connects the disparate worlds . There are 17 worlds , each with unique characters , a single primary goal , and secondary activities . In " Lamp Lighting " , the player activates lights while flying past silhouettes , and each light adds a new layer of music . The player flies through a series of color @-@ changing circles to access the next world . In Sponge Land , an underwater world , the player gathers fish to swim alongside the Long Mover . The player can collect seeds in the Kite Village . Another level lets the player create shapes in the sky by flying past stars . The worlds are presented in flat colors with no outlines , and all worlds are unlocked from the beginning of the game . The credits roll once a hidden multicolored serpent is freed from each level . 
