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Portal 2 Chapter 3 Test Chamber 12
sp_a2_bridge_the_gap.bspBridge the Gap
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. Wheatley also makes an appearance at the start of the level.
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.