I assembled the MK129 crawling microbug. It seems to be working as specified except it moves away from light (backwards) instead of towards it. Could a component have been installed with the polarity reversed to cause this behavior?
Probably motors are connected the wrong way ?
I had the same issue. I had connected the red dotted side of the motor to the positive lead. When I switched it so the red dotted side was at the negative lead, it worked correctly.