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You don't have to play the previous games... Sure, you'll miss lots of stuff but I think you're still going to understand what's going on and enjoy it (and if not, you wouldn't have enjoyed it anyway). Really, all you have to know is nothing and if you really want to know something, it's that Snake (the main character - the one you play) is a clone of Big Boss. Oh, and Raiden was the playable character of MGS2 in case you happen to run into him. And the Patriots are running the US behind the scenes. Anyway, the previous games just give depth but aren't necessary for understanding the plot.