“I can't get over how small you are!” This article is a stub. As such, it is not complete. You can help Portal wiki by expanding it.
Portal 2 Chapter 9 Mash-up
sp_a4_finale1.bspFinale 1
This is the fifty-seventh level of the game and the first part of Chapter 9. The level takes place within an Aperture Science decoy Test Chamber and the maintenance areas of the facility, and features the Aerial Faith Plate, Excursion Funnel and Conversion Gel. Crushers are present as the primary hazard in this level.
Fire a portal on the Conversion Gel and the other one on the wall next to the monitors.
A drop of Conversion Gel will paint your platform. Shoot either portal under yourself to get to the catwalk. It doesn't matter which, as for instance you use a blue portal above the catwalk and then fire one underneath, the orange one will be moved over.
Continue walking along the catwalk.
Stop when you get to the end of the catwalk and shoot a portal on platform below the catwalk.
Place the other portal on the wall on the right higher above.
The Part Where He Kills You by Aperture Science Psychoacoustics Laboratory [3:23] | Download| Play
Fake escape
Near the start of the excursion funnel, there's a girder that looks like a possible escape from Wheatley's clutches. However, not only doesn't it lead to any portalable surface, it doesn't actually exist in the first place: Any object, player included, passes right through it.
Trivia
When portalling the tile in the middle of the conversion gel, the game will always place the opposite colored portal onto the escape route at the same time.
Download | 
Play
