I don't know what these pistons are supposed to be doing, but they're going to make it quite a challenge to reach the top of the room.
What do I do?
First things first - keep your eyes on the ceiling, and try to create a portal as high up as you possibly can.
The pistons near the top aren't as dangerous to stand on as their lower counterparts.
Where do I stand?
In the corner next to the 'Over Here' scribble, where you've got a few seconds to copy my portal placement when the pistons have receded.
What now?
Peek through the portal, and you should see the way forward - through a fence, of course.
Hmm...
Timing is everything - and if you start falling, try to hit the ground ASAP before you get crushed!
Peek through the portal until the pistons directly below you are safe to stand on, then quickly step onto them.
You'll then need to make a portal on the ground behind the fence, then jump back through the portal behind you or try to fall past the pistons and create a new portal to reach the next room.
Guide help
This is the low-spoiler guide for "The deathtrap 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.
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