This is for beating the sixth Riddler challenge which is located at the Orphanage in the physics room after beating challenge 5.
You control both cats and bats.
You'll see you have to move pipes to transport an electric charge from start to finish.
Remember this. :
catwoman - light
Batman - medium
Combined - heavy
The more weight you put on the pressure pad, the higher it goes.
So start with batman on the left, and catwoman in the middle. Use bats to start the charge by bataranging the ?
Once the charge has passed the first pipe, move batman to the third pad. Once it's passed the second pipe, move cats also to the third pipe. After the third pipe, move bats to the second pad. Move cats to the first. Finally, move bats to the first with cats to complete the challenge.
Beat the goons (cats can only attack red/bats blue) and collect your Key and your achievement,