Blocked Box - Stewart Coffin Design #199 by Henry Strout

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.”