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Control Panel

Control the bridges with a central panel, but don't get stranded!

EDIT: Since this is getting played, here is a step-by-step solution if you're struggling.

Assume that the wall with the exit is North.
Hints for obtaining the SW cube:
1. Place a portal in the panel area. Using the SE cube, activate the SE button. Cross the bridge to the E wall and portal to the panel. Remove the cube. Go back through the portal to advance.
2. It is safe to use either faith plate to cross to the W side, as there is a portalable surface allowing you to return to the panel.
3. Portal from the W wall back to the panel. Activate the SW button. Go back through the portal to advance to the cube.

Hints for obtaining the N cube:
1. You must obtain the SW cube first.
2. Use the SE button to advance to the E wall and faith plates, as before.
3. Activate both the NW and NE buttons. Go back through the portal. Use the nearer faith plate, and advance to the cube. With the NE button activated, you can escape using the second faith plate. Portal back to the panel using the W wall.

Hints for opening the door and reaching the exit, once you've obtained the cubes:
1. The NW button connected to the exit can be accessed from the W wall. Simply activate the NW panel button and place one of the cubes there. The NE button connected to the exit can be accessed similarly from the E wall.
2. Once the exit is open, use your remaining cube to reach the E wall (if you aren't there already). Place the cube on the NW button. Use the nearer faith plate and advance to the exit.