It's hard to tell you why without getting near spoilers, but there's a reason that Portal is on a buncha people's best games list beyond the novelty of the physics brainteasers.
I would encourage you highly to stick with the game through the whole "puzzle test" thing. And I'll leave it at that.
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I would encourage you highly to stick with the game through the whole "puzzle test" thing. And I'll leave it at that.