Amiga port of Snow Bros. to be as close as possible to the arcade original, playing the coin-op machine from start to finish while using it as reference when taking notes about certain elements such as animations, graphic techniques and enemy AI. Work on the conversion was primarily done on Amiga and Atari ST-based systems, while custom software was written to animate sprites and build stages as a jigsaw puzzle using low memory, which allowed an easier coding process to implement every element from the arcade version like hidden bonus secrets. Artists Philippe and Lionel Dessoly, as well as Francis Fournier adapted the arcade artwork for the conversion, using a ST set-up for maps and sprites, while Pierre Loriaux was responsible for sound design. The crew also included new additions such as cutscenes between stages and Adane was also able to replicate the original gameplay speed, though alterations had to be made to make the game more playable. However, Adane stated that co-op play was removed in order to maintain a stable frame rate during gameplay, which was deemed by Djan as "probably the most important factor." Release Snow Bros. was first released for arcades in April 1990, in Japan by Toaplan and North America by Romstar, and later in Europe the same year. The game ran on a proprietary arcade board manufactured by Toaplan, which was notable for its small size. The soundtrack was composed by Osamu Ōta. On 21 October 1990, an album containing music from the title and Out Zone was co-published exclusively in Japan by Scitron and Pony Canyon, featuring an arranged soundtrack composed by Ōta. Ports The Game Boy conversion, titled Snow Bros. Jr., was developed by Dual and first released in Japan by Naxat Soft on 24 May, 1991 and later in North America by Capcom on January 1992. It is single-player only and changes the story to compensate for this by having one of the titular snowmen twins be kidnapped while the other sets out to rescue him. Several other aspects of the game were changed due to the technical restrictions of the Game Boy, such as bosses that originally fought in pairs in the arcade version now fight alone and potions are now given different shape due to the lack of color display on the original Game Boy. The Game Boy version also adds an extra set of 10 levels after the