Complex Mind is a high-octane techcore instrumental by YUKIYANAGI, originally released on the 2020 album TECHCORE EVANGELIX 02 before finding its way into maimai DX FESTiVAL PLUS. Clocking in at 175 BPM and spanning 2:24, the track delivers a relentless barrage of sawtooth synths, pounding kick drums, and aggressive basslines characteristic of the techcore style, a fusion of hardcore techno and industrial electronics. The song carries no vocals, leaning entirely on its rhythmic drive and dynamic structure to carry the energy. In maimai, Complex Mind was introduced on May 12, 2023 as part of the MEGAREX Area (MEGAREXちほー) unlock event, where players needed to accumulate 680 km of travel distance to access it during a limited window. Its Expert chart was designed by はっぴー, while the formidable Master chart, rated 13+ (13.8), was crafted by サファ太, featuring 882 total notes with a notably high Break-note count of 68. Beyond maimai, Complex Mind also appears in the rhythm game Paradigm: Reboot, marking one of the few non-maimai rhythm game appearances for the track.