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Metal Gear was released for the MSX2. It was developed as a stealth game because of hardware limitations at the time: having too many enemies on screen made action slow, so gameplay was made to focus on avoiding combat instead.
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A direct sequel to MG1, the game established many of the gameplay elements that would transition into the 3D games to be released over the next 2 decades.
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The first 3D game in the series, took everything from MG2 and expanded on it in the new 3D spaces available on the Playstation.
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The first game on the Playstation 2
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A prequel to all previously released games, it added new mechanics and is set in a Cold War setting.
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Set in the (then) future, it is the "conclusion" to the overarching story arc.
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Set in Costa Rica in 1974
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MGSV part 1. Released as a short prologue to the full MGSV game under pressure of the publishing studio.
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The "full" release of MGSV, set in 1984. Series creator Hideo Kojima left the series after the release after decades with the company.