Portal 2 Chapter 4 Test Chamber 20

Portal 2 Chapter 4 Test Chamber 20

sp_a2_triple_laser.bsp Triple Laser

---

---

---

This is the twenty-ninth level of the game, and is the first level to be set within a fully-repaired and functional Aperture Science Test Chamber. This level requires the player to combine precise Portal-placement and multiple Thermal Discouragement Beams in order to proceed.

Contents

Mechanics

• Laser Receptacle
• Discouragement Redirection Cube
• Laser Relays
• Light Strip (blue, pink)

Characters

• Chell
• GLaDOS

Objective

• Complete GLaDOS' Test Shaft (Test Chamber 20)

Hazards

• Thermal Discouragement Beam

Locations

• Aperture Science Enrichment Center
• Test Chamber 20 (GLaDOS)

Walkthrough

• Walk over to the Beams and place a portal on the wall on the left-side where the Beam ends.
• Place the other portal to the column facing the three Receptacles.
• Pick up the cube that is already redirecting one of the Beams. Place the cube in front of the portal, so the Beam activates the middle Receptacle.
• Pick up the other cube and place it over the beam coming from the ceiling. Aim it at the Receptacle on the right side.
• Go to the Chamberlock.

It is also possible to complete this chamber without placing any portals if you position the cubes correctly and use a cube and quickly move the cube from side to side. If you do it correctly, holding down the strafe right movement key (default D) the door will open for a split second, letting you slip inside. This is a more difficult solution to the puzzle so the basic solution is recommended.

Video walkthrough

Download demo file

Load video

YouTube

YouTube might collect personal data. Privacy Policy

ContinueDismiss

Music

Main article: Portal 2 soundtrack

Triple Laser Phase by Aperture Science Psychoacoustics Laboratory [4:15] | Download | Play

Gallery

An overview of the Test Chamber.