Andrew has briefly turned his attention to packing puzzles and boy was it a windfall for all puzzle enthusiasts. This is the Corner Cube from his ARCparent Series. I love packing puzzles and I hope all of these designs will eventually appear on my site at some time. Simple pieces that have to be packed into the simple box and boy this is a challenge. Because you also must fill the opening with those pieces. I struggled with getting the pieces in and out!