Schloss 250

An intriguing wooden lock that needs no key to open. There are four sliders that move horizontally, but they can’t move freely. You’ll need to move them in a sequential order and, as the name suggests, you need to do a minimum of 250 moves to open the lock. Invented by the prolific puzzle designer Jean Claude Constantin.

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schloss intriguing wooden lock key open sliders move horizontally can’t freely you’ll sequential order suggests minimum moves invented prolific puzzle designer jean claude constantin