1. Press each button and turn it off again so you can see which lights it affects.
Top left button: 2nd 3rd 4th lights
Bottom left button: 1st 2nd lights
Top right button: 1st 3rd lights
Bottom right button: 4th light
AND THE SECRET BUTTON!!: 3rd light
Press the top left button, then top right button, then the secret button (above the top right button, right above where the brick goes into the wall)
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2. Proceed to the next level!