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Half-Life: Opposing Force Hints
The red door on the top floor, just past the elevator shaft, is locked!
1 of 8: Look nearby.
2 of 8: There is a vent.
3 of 8: There is a small box on the floor.
4 of 8: Break through the vent and use the small box to get you high enough to jump into the air duct.
5 of 8: Jump into the air duct and follow it around.
6 of 8: Unfortunately, the air duct breaks, dropping you into a dank crevice behind a wall.
7 of 8: Kill the bullchicken waiting behind you, make your way out of the water, and head back into the hallway via a broken section of wall.
8 of 8: You will have successfully circumvented the locked red door.
