GEOMETRIC DANCE is an instrumental composition by Maoki Yamamoto (山本真央樹) that bridges all three of SEGA's major arcade rhythm game series, ONGEKI, CHUNITHM, and maimai. The track first premiered in ONGEKI SUMMER on September 26, 2019, and later crossed into maimai DX BUDDiES on September 14, 2023 as part of the ONGEKI & CHUNITHM genre category. Running at 150 BPM with a duration of 2:33, the piece is purely instrumental, no vocals, no lyrics, driven by a crisp electronic beat and a melodic structure whose angular, syncopated phrases evoke its geometric title. The maimai DX chart set comprises four difficulties. The Lv14 MASTER chart (difficulty constant 14.4), designed by ロシェ@ペンギン (Rocher@penguin), stands out for its heavy Touch-note count (92 notes), a hallmark of the DX cabinet's touch-screen input that sets it apart from traditional arcade rhythm games. The Lv12 EXPERT chart (constant 12.5) was crafted by みそかつ侍 (Misokatsu samurai). Both designers are recurring contributors to the maimai series, and their contrasting approaches, Rocher@penguin's dense, multi-layered patterns versus Misokatsu samurai's more measured layouts, give players distinct challenges across the difficulty tiers. As a cross-series commission, GEOMETRIC DANCE also carries chart sets in CHUNITHM SUN PLUS (designed by みぞれヤナギ and ぴちネコ) and in ONGEKI (designed by ものくろっく and ロシェ@ペンギン), making it one of the few tracks playable across all three SEGA rhythm game ecosystems under different mechanical paradigms.