Camera Rotation Sensor

I love the effect in games where you enter a room, turn around, and where you came from is no longer there. You are presented with a new path that wasn’t there before.

Is there a simple way in the BGE to take the rotation of the camera into account as a sensor and have it trigger an actuator? I have a feeling that this isn’t possible with logic bricks alone, but could someone steer me in the right direction?

Maybe. You could use a radar sensor on the camera so you can get an idea of what the player is facing. Then you can see if he is facing the door or is not.

I’d say: just learn python.