Cider P@rty is an original instrumental composition by Ryo Fukuda, added to maimai DX during the BUDDiES PLUS update on May 10, 2024. Running at a brisk 180 BPM, the track blends bright pop electronics with an energetic drive, characteristic of Fukuda's style in the maimai original catalog. The music video was created by an artist credited as サム (Sam). Despite its cheerful title and upbeat sound, Cider P@rty is thematically paired with a surprisingly dark piece of flavor text tied to the Metropolis Area 8 event, a sci-fi vignette about an alternate-history Tokyo where a newly discovered high-energy substance called "Newt" triggers global mechanization, only to be followed by a mysterious petrification disease known as 石化症 (Sekika-shō, "Stone Sickness"). This contrast between bubbly presentation and dystopian lore is a hallmark of the Metropolis area storytelling. On the gameplay side, the EXPERT chart was designed by きょむりん (Kyomurin), while the MASTER chart (level 13, constant 13.5) was handled by Jack, whose chart is notable for its dense Slide-note count relative to its total note pool.