MEGATON BLAST is a collaborative instrumental track by BlackY and Yooh, two composers deeply rooted in the SOUND VOLTEX public-recruitment (公募) scene who also produce together under the joint alias BlackYooh. Originally created for SEGA's ONGEKI PLUS, the song crossed into maimai during the Splash PLUS era as part of the ONGEKI & CHUNITHM crossover campaign (オンゲキちほー3), a limited-time event area where players could unlock it by progressing through themed challenges. True to its name, the track delivers an unrelenting barrage of high-energy synth leads, pounding kick drums, and rapid-fire percussion at 194 BPM, with no vocals, the instrumental intensity speaks for itself. The collaborative spirit extended to the charting side as well: the MASTER difficulty was co-designed by The ALiEN and Phoenix under the joint byline "The ALiEN vs. Phoenix," while the EXPERT chart was crafted by シチミヘルツ (Shichimi Hertz). Upon its debut in maimai, MEGATON BLAST set records for the highest note counts on both the ADVANCED and EXPERT difficulty tiers—milestones that stood until later updates introduced denser competitors like Xaleid◆scopiX. The song also made appearances in CHUNITHM CRYSTAL and TAITO's GROOVE COASTER series, cementing its status as a crossover rhythm-game staple.