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Solving the unsolvable5 hints left
You're still here? I guess we have a puzzle to solve, then.

What do we have here?

The button you need to activate is on the other side of an emancipation grid.

A what?

Think of it like a barrier; if you try to take a cube through or have a portal open when you walk through it yourself, they'll be destroyed.

Hmm...

You can create a new portal when you walk through the grid. It will still connect to the orange one.

Where is the orange portal?

On top of a raised piston.

Can you get a cube up there?
Send a cube through a blue portal to get it in front of the orange one, then walk through the emancipation grid.

Create a blue portal in this room, then pull the cube through to put it onto the button. This will unlock the door that leads to the exit.

Guide help

This is the low-spoiler guide for "Solving the unsolvable" 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 09"
Hints written by Kieron West
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