World 1 - Level 3
The Mystery Deepens
Follow the Yellow Path, pushing the reflectors into position to eliminate the broken Z-Bots. Collect all coins. Now push the green steel box into the water and push the green reflector to the side to collect the guarded Rainbow coins. Finally, move the wood box along the green path. There are two conveyor buttons for different parts of the conveyor belt, and only the top button will create a path for you to traverse.
Somewhat hidden Bonus Coins are located at the blue circles.