Leisure Suit Larry Wet Dreams Dry Twice: Tunnel System

Hi guys, if you have trouble understanding how this tunnel system works, I took my time to figure out and want to share it with your (my first guide :-)):

1. You need the updated map from Lefty. Hand in your map to him.
2. Enter the tunnel.
3. The loop:
You enter a level/stage and you see objects which are highlighted in pairs on your map.
Sometimes a sound appears, maybe even more than one time.

You have to combine the objects and sounds together and see if they match as pair.

If you find a match/pair, the green arrow says where you are NOT allowed to go.
Find all pairs until you have the way you cannot exclude.
Keep out sign means you are not allowed to use this path, this will lead to a reset.

I added a picture to give you a better understanding.