Wil Strijbos Coke Bottle Puzzle. The objective is to remove the padlock from inside the bottle then put the padlock back. No external tools are allowed, just what is provided with the puzzle. A good puzzle with especially figuring out how to put the padlock back inside the bottle with using only the tools provide within the puzzle. Requires some “out of the box” thinking and a clever solution. Hard to find this puzzle nowadays and comes in very good condition.
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