If you've ever wanted to take a gadget apart to see how it works, here's an excellent puzzle for you. Dismantlement is a Japanese puzzle where you are given a small radio and the task of taking it apart. The only tool that you're given is a screwdriver, which means hunting for screws and trying to figure out how to remove each component so you can get at the rest. It's the ideal way to satisfy your technical curiosity without, y'know, breaking something or even hurting yourself. It's a great idea and I hope it's followed by more puzzles featuring other devices.