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The third activation hole6 hints left
The third activation hole has no pellet dispensers nearby, and is hidden behind two doors. Did I mention there's no portal-friendly surfaces in the room?

What do I do?

First things first - finding a pellet.

How many have you seen so far?

Hmm...

You travelled down two pellet corridors at the start of the chamber. Even if you used one of the pellets earlier, there should still be one active dispenser you can use.

Help me out.

Create a portal at the end of the still-active pellet corridor, and put the other on the protruding panels in the 'main' room.

Now, you just need to figure out how to open both doors at once - without opening any more portals.

Quite the task!

The button that opens the second door is slightly out of reach.

For you, that is.

Hmm...

You can't reach that button, but the cube can - drop it on top of the button.

Don't forget to pull your weight, though - there's still another button to press.

Help me out.

You'll need to stand on the other button yourself. Try to stand on the edge of it, though, or you might get hit by the pellet.

When the third platform has risen, you can jump along the top of them to reach the next area.

Guide help

This is the low-spoiler guide for "The third activation hole" puzzle in Portal. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.

Up to "Test Chamber 17"
Hints written by Kieron West
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