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The ceiling-crushing pistons8 hints left
A short walk through the corridor reveals another piston room - one where two pistons are constantly pushing against the ceiling.

What do I do?

The room behind the fence isn't very portal-friendly, so try working with the room you're currently in.

How far up does it go?

Hmm...

Look up - there's a portal-friendly platform just opposite the pistons.

The ceiling above the pistons is portal-friendly, too.

How does that help me?

Your timing will need to be good, as that other platform is right above two horizontal pistons - but getting to the top of the room is your goal.

How do I get up there?

Remember, the ceiling above the two pistons next to you is portal-friendly.
Place your portals in the positions seen below, then ride a piston so it pushes you through the portal.

You can then walk across the horizontal pistons to reach the nice, safe, solid platform.

You've not reached the top of the room yet! Keep looking up - there must be an exit within reach.

Hmm...

There's a slow-moving piston above you, but it's not going to be much help.

You need to reach the platform at the very top.
Do the 'portal on the wall, portal below your feet' trick once again to build some momentum and reach the platform.

Guide help

This is the low-spoiler guide for "The ceiling-crushing 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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