Geometry Dash Sky Tower is an Easy Demon level that Alkali created with a rating of 10 stars and 3 user coins. It is the continuation of his first level, In Silico, and the second level in the Silico trilogy. Alkali designed the level around a tale in which he uses a mystical stone he stole from a location known as "Sky Tower" to save his companion Alkali from pirates. In the level's demonstration video, he further produced an animation of the narrative. This game is regarded as one of the greatest in the genre by many gamers in the community. According to Rafer, it has been in the works for almost two years. The Tempest continues the story of Sky Tower, and Floodfall Caverns makes reference to it in the epilogue.