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Portal 2 Hints
Item Stacking Tip
1 of 4: Any items that you can pick up and carry around can be used to create a stack of items. Simply drop one item on top of another in such a way that it won't fall off.
2 of 4: NOTE: The cameras you often see on test chamber walls can be knocked off and used as stackable items by opening one side of a portal on the wall section that the camera is attached to. (If the wall section isn't portal-resistant, that is.)
3 of 4: Stacking items can be used to create makeshift "staircases" that you can jump up to get onto things that are otherwise a bit too high to jump onto, and that you can't portal-drop onto from above.
4 of 4: The only problem is that there aren't all that many items that make good stacks that don't fall down as you're trying to jump up them. You'll have to have a lot of patience and try stacking things several different ways.
