4 Key Surprise Box Puzzle
thingiverse
This was inspired by a Mini Lock Box Puzzle by CrazyBlackStone [https://www.thingiverse.com/thing:4606970] I liked the idea but wanted a space to put in a surprise for my grandchildren when they have opened it so I redesigned it with the keys in each corner and incorporated a box underneath. Update: The top part had a neat void between the locks and I made sure that it was big enough to hold a small coin (such as a UK £1) so it seemed sensible to redesign the surprise box puzzle to omit the box as shown here. [https://www.thingiverse.com/thing:4722896]
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