Portal 2 - Phase 1 - sp_a3_crazy_box - Route.mp4
This is szeimartin's route with some small changes. In the first part, I simply use the same portal that I shot to have the repulsion gel blob go through to do a reportal to the catwalk ledge outside. Unfortunately, I goofed up and missed the railings on the catwalk in this video, but I'm sure when I would do a speedrun, I would figure out an optimal way to stay on the railings to get to the next door as quick as possible.
The second room I optimized a lot. I don't do the glass breaking glitch to get the cube, but instead use the button save glitch. Then, instead of falling out of the wall portal twice to get momentum, a good rule of thumb is, "You can never have enough reportaling!" So, I reportal to get enough speed to do the 'backflip' portal fling to get to the catwalk outside. Enjoy!