This is not valve's original trailer. It's actually like a reenacted video. If you look and listen at the smaller details, you can point out a few things that are different such as: Different turret explosion sounds (original one used the HL-2 explosion), the portal gun still emits the teal-ish particle effects as in portal 2, but for a split second before the gun is hidden away like in the beta, and i could go on a bit more on it.
plasmawario
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