Cthugha is a high-energy instrumental track by Japanese composer and DJ USAO (Masaharu Kubota), introduced to maimai DX as part of the FESTiVAL PLUS update on April 14, 2023. Originally created for the rhythm game Muse Dash (developed by hasuhasu/peropero), the song was ported through a collaboration event and quickly became a staple of maimai's GAME & VARIETY category. Its title draws from Cthugha, a fire elemental deity in the Cthulhu Mythos, continuing USAO's pattern of naming tracks after Lovecraftian entities, a thread that also includes Cyaegha (in Arcaea) and Hastur (in REFLEC BEAT). At a relentless 213 BPM, the track is built around aggressive synth-bass riffs, rapid-fire kick drums, and chopped vocal stutter samples, some of which are shared with USAO's earlier maimai entry Blows Up Everything. The result is an unrelenting, festival-ready bombast that translates naturally into dense chart layouts. In maimai, the song's four DX charts span from Basic (level 6) to Master (level 14, constant 14.2). The Expert chart was designed by 翠楼屋 (Suirouya), while the demanding Master chart, packing 1,168 total notes with heavy slide and break-note clusters, was crafted by Jack, a designer known for stamina-intensive high-level patterns.