The Four To Square is a 4-piece 2D packing puzzle designed and made by Jacques Haubrich. This puzzle was entered into the 2011 IPP Competition in Berlin. Made of stainless steel, the puzzle is 73mm square in size. Overall quality and construction is very good and the 4 irregular shaped pieces are of a slightly different colour tone from the tray giving the puzzle a nice contrast. The object is to pack the 4 pieces flat into the tray.
Overall, a nice little (no pun intended) challenging packing puzzle.