The platforms are moving in the least helpful direction possible. Time to put your timing to the test!
What do I do?
There's a decent amount of space between each platform - jumping is out of the question.
Hmm...
The walls are all portal-friendly.
You can peek through portals before stepping through them.
Put a portal on the back wall, and a second one somewhere you can step through. When the platform's in a convenient spot, step through it.
What now?
There's still a bit more corridor to navigate! Repeat the process, creating a portal a bit further ahead each time. If the timing is proving difficult, you can always ride the platform to the end before stepping onto a new one.
Guide help
This is the low-spoiler guide for "Navigating the deadly corridor" 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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