The Hardest Puzzle Lock

Magician and puzzle fanatic Chris Ramsay shows off an incredibly complicated “Level 10” puzzle by designer Rainer Popp. The beautifully-crafted T11 Popplock weighs in at about 5 pounds, and requires a sequence of 13 tricky steps to unlock it. The only clue provided is to use the key in the keyhole – but there is no keyhole.