fighting skills by other alien alliances, Out Zone takes sides with no one and are willing to fight any wars for the proper price. Under desperation and as a last-ditch effort to counterattack Owagira's military force, the UN requests Out Zone's service, guaranteeing the UN member nations' entire annual budget as payment. With negotiations complete, two very powerful cyborg mercenaries belonging to Out Zone volunteer for the mission. Having ties to Earth and realizing that their homeworld is in great peril, the two warriors rise up to save it from doom and destroy the Owagira Forces. Development and release Out Zones soundtrack was composed by Tatsuya Uemura, who also created the sound effects while Naoki Ogiwara served as designer. Uemura recounted its development process and history in interviews, stating that it was difficult for him as he could not apply his experience from vertical-scrolling shooters with flying ships, as players controlled the game on-foot and could not design its progress. He stated that the project was fundamentally different due to the lack of forced scrolling, which did not required skills from vertical shoot 'em ups and players could move or stop freely. Uemura stated that the intro was written during creation of the demonstration sequence, as the game's world was already established. The team integrated puzzle elements not found in ship-based shooters, which took time to plan out and Uemura stated that the schedule for sound production was constantly being reduced, barely implementing the music during development. For the first stage's music, Uemura revealed in response to a user on Twitter that the main melody was originally composed based on Taiyō ni Hoero!. When composing music for the last stage, Uemura wanted to convey the sense of a "decisive battle". Uemura has since regarded the project as "the most difficult product he worked on". Out Zone was released in arcades worldwide in August 1990 by Tecmo, Romstar and Toaplan. On October 21 of the same year, an album containing music from the title and Snow Bros. was co-published exclusively in Japan by Scitron and Pony Canyon, featuring an arranged song composed by Uemura. Unlike several other releases by Toaplan, the title remained exclusive to arcades and did not receive any official port to home consoles. In April 2020, M2 announced a new version of Out Zone as part of their M2 ShotTriggers publishing label. It was first announced to be