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The five huge pistons3 hints left
Are the ladders in better condition than the stairs?

No!

What do I do?

The pistons must be powering something - have you looked up to see where they go?

Hmm...

The broken ladders lead to separate areas.

Could the pistons get you up there?
Stand on the piston in the middle of the room. When it's fully extended, you'll see a corridor right in front of you - and should create a portal on its wall to get inside.

Guide help

This is the low-spoiler guide for "The five huge pistons" 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 "Escape Part 2 (After the Pistons)"
Hints written by Kieron West
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