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Extra note: As a personal recommendation from a fellow fan of the franchise, do yourself a favor and play the games in release order regardless of the actual chronology of the universe, assuming that THE OP might be asking this because they want to play the games in the order of the in-universe timeline. The games are designed to be played in the order that they were released (most notably, Kojima thought he was making the last MGS game every time in the main iterations), and the plot, although somewhat disjointed, will make more sense digested that way.