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Walking along the tubes3 hints left
A change of scenery! Shame about the acid.

What do I do here?

Use the tubes as a risky walkway until you drop down and come face-to-face with another piston.

What now?

As always, you'll need to stand on top of the piston to reach the next area.

Look around for portal-friendly surfaces.
Put a portal on the wall above the piston's 'end point', and another on the wall just above the acid a few steps back.

When the timing's right, jump through the portal that's above the acid to end up on top of the piston and ride it to the next section.

Guide help

This is the low-spoiler guide for "Walking along the tubes" 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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