QUATTUORUX is a high-energy collaborative track created by three artists: 打打だいず (D-D-Dice), Tanchiky, and からめる (Karameru). Originally released as an April Fools' Day 2024 music video, the song was later added to maimai DX BUDDiES PLUS on July 11, 2024, announced just one day prior to coincide with the franchise's 12th anniversary. The track sits at 220 BPM in the GAME & VARIETY genre, propelled by a pounding electronic arrangement, shouted lyrical refrains, and a theatrical breakdown driven by Tanchiky's writing and Karameru's vocal performance. The MASTER chart, designed by サファ太 Vs. Safari Vs. さふぁた, is infamous among players for its BREAK note count of 300, the highest in any non-UTAGE (non-boss-collaboration) maimai chart, tied only with MYTH Re: LEASE. Of those 300 BREAK notes, 52 are EX BREAKs and 40 are BREAK SLIDEs, placing the theoretical maximum score (AP+) difficulty among the most punishing in the game's history. The EXPERT chart, designed by 鳩ホルダー (Hato Holder), is a 13.0 with 800 notes that serves as a demanding warm-up to the MASTER onslaught. The music video, directed by yoshimo, features cameo appearances from over a half-dozen BMS and rhythm-game composers, including Atsushi Morimori, Juggernaut., sky_delta, and irucaice, and directly parodies the video of Latent Kingdom, another yoshimo-directed maimai track. QUATTUORUX also appears in several other rhythm games such as Lanota, PLATiNA::LAB, Polaris Code, Rotaeno, and Rizline.