Well, the original Metroid can be beaten in less than two and a half hours, remember. Nobody managed that the first time around, of course, but it's possible. I want to know if that 7 hours number means 7 hours the first time through (in which case it easily outlasts the other games) or if it's more like the 2.5 hours time for the other games.
In any case, there will probably be lots of power ups and missiles and the like to pick up, so you can always play the game through again to pick them up. That's the adventure aspect of the game, I suppose.
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