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The rapidly moving pistons6 hints left
When you've reached the top of a room that crushed me more times than I'd like to admit, the path will be blocked once again.

What do I do?

You could try to climb over them, but that just added to my embarrassingly high death count.

Hmm...

The wall behind the pistons is portal-friendly, but the position you stand in it crucial.

Where should I stand?

Far to the left, where none of the pistons extend quite far enough to block your path.

What now?

Two more pistons block the way - but once again, the room behind them is portal-friendly.

What do I do?

Pick a good position and / or time your shot carefully. That's all there is to it!
Shoot a portal on the back wall in the split second before your vision is blocked, or stand slightly to the side of the pistons for a better view of the back wall.

Once inside, the path ahead lays can be found above you - again.

Guide help

This is the low-spoiler guide for "The rapidly moving 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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