This kumiki puzzle, the Trolley, is a sliding panel puzzle box.
It’s also a coin bank.
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photos for details < (We don’t have a Shopping Basket set-up on this site (Why not?) Use our copy
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“A mechanical puzzle is a self-contained object, composed
of one or more parts, which involves a problem for one person to solve by manipulation
using logic, reasoning, insight, luck, and/or dexterity.” - Jerry Slocum
