Endolphin Surge is an electronic rock song. It begins with heavily vocalized singing, before a relatively lengthy instrumental break. Then two different voices alternate between each other, singing, all while backed by the drums. It is one of five multiplayer themes included in Splatoon 2 at launch. Like all battle songs, it has a random chance of being played during online matches. It can also be heard in Squid Beatz 2, with a maximum score of 202 and 426 in Normal and Hard modes, respectively.
See also: Endolphin Surge
Endolphin is a pun, based off endorphins, natural body chemicals that relieve pain and increase pleasure, primarily from exercise, and dolphin, the aquatic creature. The high felt from endorphins could represent the excitement while battling.