The 90's Decision is an instrumental track by Japanese composer MYUKKE., best known in the rhythm-game sphere for high-energy electronic originals that frequently appear across multiple genre titles. The song was ported to maimai でらっくす FESTiVAL PLUS as part of a crossover with the side-scrolling rhythm game Muse Dash, where it originally debuted. The track's title continues a numerical naming pattern from MYUKKE.'s earlier composition The 89's Momentum, also found in Muse Dash and later Cytus II, suggesting a thematic mini-series defined by punchy beats and a driving, retro-flavored sensibility. At 128 BPM with no lyrics, The 90's Decision delivers a clean, instrumental groove built for gameplay, leaning into synths and percussive layering that recall late-80s and early-90s dance-pop production. In maimai, the song received two notable DX chart arrangements: the Expert chart by 翠楼屋 (Suirouya) and the Master chart by アマリリス (amaryllis). The Master chart at level 13 (constant 13.0) weaves 65 Break notes into a 694-note total, demanding precise timing on its denser sections. The song was initially unlockable during a limited-time Muse Dash collaboration area from April to June 2023, and later made permanently available.