Portal 2 Chapter 8 Test Chamber 12

This is the fifty-fourth level of the game, and takes place within an incomplete Aperture Science Test Chamber and the maintenance areas of the facility. This level introduces the Laser Field, and features the Thermal Discouragement Beam as its primary mechanic.

Hazards

 * Falling to your death
 * Thermal Discouragement Beam
 * Laser Field

Trivia

 * This is the only test chamber to freature the laser field in the entire game.
 * This level introduces the only test element that does not appear in the Coop.

Test Chamber 12
The chamber is rocked by huge tremors as the reactor core continues to destabilize. Wheatley vainly attempts to convince GLaDOS and Chell that these are programmed into the test chamber "for old times' sake". After the test is solved, there is still no euphoria for Wheatley, and he seems to be coming to terms with it. The elevator to Chamber 13 is "out of service - because it melted", so Wheatley rigs an Excursion Funnel to transport Chell there instead. However, a rail breaks, sending a test chamber hurtling towards Chell. It is halted by some more rails just before it hits her, but Wheatley, true to his programming, deactivates the Excursion Funnel and lets Chell and GLaDOS to fall into the abyss. Luckily, a catwalk breaks their fall.

This is the only level which features the Aperture Science Laser Field.

Test Chambers 13 & 14
Due to the Excursion Funnel being shut off, these chambers are unreachable but might be reacheable if the game is hacked to fly.