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Portal 2 Hints
How can I get the exit door open?
1 of 5: Look to the right of the exit door to see that there's a laser receptacle on the wall.
2 of 5: It's pretty easy to move your two redirection cubes to get the laser beam to hit that receptacle, but that won't open the exit door.
3 of 5: Look around the chamber to see that there are four relay devices imbedded on the floor.
4 of 5: There are also four blue checkmarks next to the exit door, not counting the one that's connected to the laser receptacle.
5 of 5: You apparently have to redirect the laser beam through all four relays before it hits the receptacle.
