should i play the first uncharted before i play the second one or does it matter?
Not a big deal. The single-player is great in both and you won't be regretting if you start the Uncharted 2 storyline.
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I would definitely play the first game first!
You'll become very acquainted with the main man Nathan Drake, and also going from the first game to the second game you will very much appreciate how much the game improves.
the first one is GREAT. Awesome moments and great graphics, believe me.
But then after you sit there having completed Drake's Fortune, in awe and amazement, you will put in the disc for Among Thieves and
HAVE YOUR MIND BLOWN MANY TIMES OVER!!!!!!!