Do you remember which bridges were raised in the movie for each code?
Turn your back to the center building. If a ball just happened to be going down that track, would it be going from left to right or from right to left?
A ball going down the track would be going from your right to your left. Use the code which showed the bridge on the far right being raised first. For the second code, use the one with the middle bridge, and the far left bridge for the last code.
