Under The Island is a top-down adventure game set on the colorful Seashell Island, where you play as Nia, a newcomer who quickly gets drawn into a strange and urgent mystery. Together with a local girl named Avocado, she begins investigating a frightening prophecy: the island is meant to sink into the ocean. As they explore, they uncover ancient secrets, fight odd creatures, and try to protect the home they are starting to build.