In the Makers Market: Mysterious mushroom puzzle

Xylocopa Design (of Build-Your-Own Ratmobile fame) just added this beautiful Mysterious Mushroom Puzzle to their Makers Market store:

These gorgeous engraved wooden mushrooms fit together to make a 6″ square – but in only one configuration! Assembling them may not look so bad, but trust us, it’s no simple task. Each mushroom is based on a different, real species of fungus. Fun and frustration for adults and children alike. The mushrooms are crafted from assorted hardwoods – maple, cherry, walnut, mahogany, padauk, and bloodwood – and finished with an all-natural Tung Oil finish. The storage tray is made of birch and comes with an engraved cheat guide.