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Microcosm is a 1993 rail shooter video game developed by Psygnosis and released for the Sega CD (also known as the Mega-CD) in North America and Europe. The game was met with mixed reception from critics, who praised its visuals but criticized its gameplay and lack of replayability.

The player takes control of a futuristic fighter craft called the "G-Suit" which can be customized with various weapons and upgrades. The goal of the game is to explore a mysterious space station called "the Microcosm", which is filled with hostile aliens, robots, and other hazards. The player must navigate through the station's mazelike corridors while avoiding enemies and collecting power-ups that can be used to upgrade the G-Suit. Along the way, they must also solve puzzles in order to progress further into the station.

The game features full motion video cutscenes between levels, which are presented in a comic book art style. The cutscenes provide context for why the player is exploring the Microcosm and what their ultimate goal is. The soundtrack was composed by Tim Wright (who would later go on to become famous for his work on Wipeout).

As far as gameplay goes, Microcosm consists of three different types of stages: corridor stages where players must shoot their way through hordes of enemies; puzzle stages where they must solve various puzzles in order to progress; and boss battles where they must fight powerful enemies in order to proceed further into the station. Each stage has multiple routes that can be taken depending on how well players solve puzzles or defeat enemies.

Although it received mixed reviews upon release, Microcosm has since become something of a cult classic among Sega CD fans due to its unique mix of shooting action and puzzle solving elements. It also stands out for its beautiful visuals, which make use of both pre-rendered 3D graphics as well as traditional 2D sprites. Unfortunately, due to its limited replay value it isn't likely to have much longevity beyond being appreciated by dedicated fans of old school shooters.