Portal 2 Chapter 3 Test Chamber 12

This is the twenty-first level of the game, and is set within a dilapidated Test Chamber. This level features the Hard Light Bridge, and includes Goo as its primary environmental hazard. The Test Chamber also includes a Rat Man Den.

Hazards

 * Goo

Easter Eggs

 * To enter Rat Man's Den, use portals to stand on the light bridge, then look up to the ceiling. There are portal panels through a hole in the ceiling, shoot a portal to those and drop in. Navigate around the air ducts to find Rat Man's den.