WARNING: SPOILERS
On the last puzzle, I'm pretty sure that's how to do it. In stead, what I did was I got to the other side by riding the plug with the magnet. Then I waited for the plug to stop right below the magnet dropper and stepped on the Orange Button. Then I threw the magnet into the spikes and the magnet got on top of the plug.
So, in my opinion, the puzzle was fair, just a little tricky.
