Portal 2 Chapter 9 Mash-up

This is the fifty-seventh level of the game and the first part of Chapter 9. The level takes place within an Aperture Science 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.

Hazards

 * Falling to your death
 * Crushers

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.

Test Chamber 17
This test serves the purpose of tricking both Chell and GLaDOS into a trap without them expecting it to be happening this soon. The two are catapulted into an Excursion Funnel. Wheatley explains that he found GLaDOS' test bots and has decided to eliminate Chell and test with the robots. A panel then catapults them directly into a huge chamber filled with Crushers and a single platform.

GLaDOS, in panic, tells Chell that "This is the part where he kills us."

Wheatley greets them saying, "Hello! This is the part where I kill you."

This is the beginning segment of Chapter 9: The Part Where He Kills You.

Reaching this chapter earns the achievement "The Part Where He Kills You."

If you spawn a sphere or cube using a cheat code and use noclip, you can go through the door and you can discover a pitch black room, just like in GLaDOS' Test Chamber 21.

Test Chambers 18 & 19
It is unknown what these two tests are, or even if they exist, as Wheatley had already planned the trap early by faking the test in Test Chamber 17. However, he hadn't discovered Atlas and P-body until before Test Chamber 15, so it is likely he modified Chamber 17 shortly afterward.