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I'll help however. You don't need to know anything about the previous games, as there is a choice at the start of either "I like MGS 1", "I like MGS 2" or "This is my first MGS game". The cutscenes apparantly change according to your knowledge.
The order goes: 1, 3, 2
And you got warned again Hibernator?
After all it is techinically a prequel to the Metal Gear games aswell.
Hibey, hibey, hibey... when will you learn?