Umm, I hope these links all work properly, because they are only sometimes working for me.
For Four Balls, I had the idea of a conveyor belt, but I hadn't ever looked through other people's designs at that point and didn't know that other people were already doing that, so I didn't know how to do it. I made the main part of it, with the row of clockwise wheels. Unsurprisingly, it didn't work. So, instead of redesigning it, I decided to just keep adding things until it worked. When the rotating platforms idea didn't work, I tried to get it to shoot them out of the end with anticlockwise wheels. Twenty minutes later, I ended up with this piece of junk:http://FantasticContraption.com/?designId=124576
This one might not look too strange, but I was actually trying to make a catapult:http://FantasticContraption.com/?designId=125337
This one is my favorite among my failed designs.
It is a champion. It really shouldn't be.http://FantasticContraption.com/?designId=145814
While talking about that level:
My first ever solution to Around the Bend is here:http://FantasticContraption.com/?designId=123850
I had never thought to try running two wheels in opposite directions like that, and it happened by accident when I forgot to build part of the structure. So I got rid of the structure, left the collapsing wheels, and it worked.
I haven't seen anybody else use that mechanic of running paired opposing wheels. Possibly it's useless? Does anybody else use it?