

The player taps circular objects, referred to as Notes, as the Active Scan Line passes over them, following the music. The main gameplay of Cytus features the Active Scan Line, a black line that move up and down across the screen. The story is told in-game through various cut-scenes that are unique to the chapter title songs in comparison, the other individual songs within each chapter are at most only marginally relevant to the plot, except for a limited few. The plot features the disaster and the protagonist's struggle with identity. Due to limited memory space, human emotions are stored in the form of music in "Cytus", and by playing the songs, the robots are able to revive their human emotions. The story revolves around the protagonist, Vanessa, who lives in a 22nd-century world where robots with human memories are the only remaining sentient beings while living humans are killed by a mutant virus. Cytus features a story plot that is carried through its 10 main chapters as well as a prologue. The name Cytus is taken from Cocytus, the Greek mythological river of wailing or lamentation. IOS, Android, PlayStation Vita ( PlayStation Mobile)
