Portal 2 Chapter 4 Test Chamber 18

This is the twenty-seventh level of the game and the first part of Chapter 4. It is set within a dilapidated Test Chamber, and requires the player to utilise advanced knowledge of the Hard Light Bridge and Thermal Discouragement Beam in order to proceed. This level features both Goo and Turrets as its main hazards.

Hazards

 * Goo
 * Thermal Discouragement Beam
 * Turrets