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Duplicare concitant buxum (V1.3)

You're going to have to think a bit outside the box.
Actually, put your thinking inside a box. Turn that box upside down. Put that box in another box, and turn it upside down. Now take your thinking out. That's where you'll need to be.

Went through 12 revisions to get this to work before it was published, thank you happyguy for testing and putting up with my stubborness! xD

But if you have to resort to video walkthroughs, you really need to reconsider if you should even play Portal anymore.