"Solving Mousetrap over and over again remains fun and challenging."
I did struggle for a short while to disentangle this one. It is fairly straight-forward to move the tail off the body of the cat and onto the head portion, the difficulty comes when working out how to extract the tail from the body. Reversing the process is also particularly difficult because the challenging part is not the exit point, it is halfway through puzzle when you are not really trying to memorise it. The statement about it remaining challenging to repeat over and over again is true. I have done it many times now and always struggle to work out the exact position for the extraction. Another excellent puzzle in the line up.