This is a clever design by Stewart that is nicely made by Henry, which was presented at IPP 25 in Helsinki, Finland marking his third participation in the Exchange.
Stewart wrote:
“Six polyomino pieces fit into a 3x3x3 box that has a cubic block attached to the top midpoint of one side, hence the name. It was presumed to have only one solution, but I was never sure until Bill Cutler confirmed it by computer.”
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