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I haven't played Portal. Now playing Portal 2 and I'm not quite sure if I understand the mechanism properly. I'm stuck in a floor in the chapter 'The Return'. I'm wondering what does blue and orange portal signify? How to use them properly? So far what I know is if I enter via one portal I'll come out of another one.

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Go through the Blue Portal and you end up at the Orange portal. Go through the Orange portal and you end up at the Blue Portal. – Joe the Person Aug 21 '11 at 16:34
up vote 14 down vote accepted

There is no functional difference between the two colours. They are just two ends of the same portal and like you said, if you enter one portal, you will come out of the other. As spencer added in a comment, the colours help you know which portal you have fired. That way you can avoid firing the same portal twice and moving it when you might not want to.

You can't have two blue portals or two orange portals up at the same time. If a test chamber has a pre-opened portal for you somewhere, you can open a portal of the other colour to take advantage of it.

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Wanted to add that colors are there help you know which portal you have fired and wont "overwrite" one you don't want moved. – riv_rec Aug 21 '11 at 5:03
In addition, the targeting reticle has two halves, one orange, one blue, which correspond to the respective left and right mouse buttons. – Raven Dreamer Aug 21 '11 at 5:33
One of the key concepts of the game, I think, is realizing that you can travel through either portal. – harbichidian Aug 21 '11 at 7:59
There is, by the way, a lot of blue/orange colour symbolism in Portal 2, but that would be for another question. – user56 Aug 21 '11 at 10:31
@Arda And here is that question. :) – Adam Lear Aug 21 '11 at 14:35

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