This is footage taken from the Portal 2 Beta DLC provided to press outlets.
In this video you can see me playing with the Puzzle Maker itself (with no practice beforehand, although that is obvious!), trying out a couple of the gameplay elements, testing the map & finally publishing it to the Steam Workshop. The process is incredibly simple, the only let down being my terrible effort!
If anyone has any requests to show certain elements of the puzzle creator I haven't shown here, please let me know. More videos on the ValveTime youtube soon.