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Breaking the puzzle2 hints left
Another puzzle that seems difficult to fail, but nothing is impossible - and you can trigger some unique dialogue if you make the cube impossible to retrieve.

How do I accomplish that?

Drag the cube against the wall so that it's slightly tilted, then position it against the door, as seen below. Save the game, then activate the button to open the door - the cube will then get stuck in it.

Open the door again, and three possible outcomes will occur.
  1. If the cube is near the door, you'll get some unique dialogue and the door will be forced open.
  2. If the cube is dissolved, you'll get a new one with no unique dialogue.
  3. If the cube lands near the emancipation grid, nothing will happen, and you'll need to reset.

What is the unique dialogue?

"Despite the best efforts of the Enrichment Center staff to ensure the safe performance of all authorized activities, you have managed to ensnare yourself permanently inside this room. A complimentary escape hatch will open in three... Two... One."


Thanks to YouTuber Marblr; I found this softlock through their excellent "Every Softlock in Portal" video!

Guide help

This is the low-spoiler guide for "Breaking the puzzle" 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 "Trivia"
Hints written by Kieron West
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