5 Colors, 120 Two-sided Squares

The pieces are made from 3mm thick hard foam board of size 3cm x 3cm. The I drilled little holes in the center of the pieces to put cylindric magnets of size 6mm x 3 mm into these holes. At last printed labels were attached at both sides so that the magnets were fixed. Now the figures can easily be displayed on iron surfaces.

Even with the computer solution it takes you some time to complete the construction. It's essential to sort the pieces before you start. Then it should be possible to finish the puzzle in about half an hour.

The rectangles of size 5x24, 6x20 and 10x12.

An almost square.