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Reaching the top4 hints left
The puzzle's not over yet! This massive room is home to an equally massive pit.

What do I do?

Remember, momentum isn't just for crossing horizontal distances.

It can also be used to build height.

Hmm...

Place one portal at the bottom of the huge pit, and the other on the platform sticking out of the acid.
Don't panic! As long as you don't move, you'll keep that momentum. Use your time in the air to get a good view of your surroundings.

Help me out.

At peak height, you'll see another portal-friendly platform. Put a portal on it, and make sure the one below you is still active.

Repeat this process for the next few platforms (and the slanted one at the end) to complete the puzzle! If you ever miss a portal, you'll need to return to the massive pit and try again from the beginning.

Guide help

This is the low-spoiler guide for "Reaching the top" 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 "Test Chamber 18"
Hints written by Kieron West
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