Our video on YouTube about all the bugs mentioned in this guide:

https://www.youtube.com/watch?v=45YEk9DV0y8

In chamber 1-7 you can easily jump to invisible textures located at the place, where a platform should appear later.

One of the most game-breaking bugs. Happens when you connect Conly to the plug, holding her closer to the electrical box. She teleports to the other side of the map. This glitch also causes a few more glitches, which are mentioned in our YouTube video.

In some places, fall triggers do not cover all the gaps. You can jump over them and not die.
Example:

In the elevator the very beginning of chapter 6 you jump higher, even while it's not moving.

Bombs in chapter 2 do not damage character. You can do high jumps with them instead.
For better understanding watch our video

In chamber 6-2, by throwing a cube under the stairs, you can make it glitchy. The cube would accelerate you when touching.

In some chambers, you can stuck in an exit door by moving back to the door while it's closing.
Example:
Door after chamber 1-4

In chamber 6-8, Conly in your hands breaks an elevator trigger, so that you can leave it while (or even after!) its doors are closing.

You can throw a cube behind the emancipation grill using a chair. For better understanding watch our video.
Yo can don't use a light bridge at all. Jump in a portal to the vactube instead.
You could do not use one cube in the chamber.
You can jump on the tube and get to the other side across a core rail.

(you should crouch)
put portal like on the screenshot

At the very beginning of chapter 5 1980. You can jump here using a chair.
In the same chapter and load point.
You can get stuck in metal decorations

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We hope that developers of one of the best mods for Portal 2, would fix all the mentioned problems with the game.