With Team Fortress 2 (TF2) and Half-Life 2: Episode 2 (HL2:EP2) packed into the Orange Box, most people who bought the pack won’t even bother with Portal until they’ve had their share of the other two first. If you’re one of these, I suggest you don’t let Portal slip into your list of "games you should have played but never did".
For instance, if you create a portal on the ceiling above you and one directly below your feet, you keep entering the first and exiting the second, creating the illusion that you’re falling endlessly. On the other hand, if you place two portals facing one another you can actually chase yourself endlessly!
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