Here is a small coffee table tray puzzle to challenge your guests. There are only four pieces but it's harder than it looks. The goal is to get all the pieces laying flat inside the tray. I have only found one solution. Of course the one solution can be inverted but I don't count that.
This is another pattern to keep you from throwing away your scrap wood. The are two different sizes of this puzzle in the pattern. The small one can be built with your smallest scraps.
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