5 Colors, 165 One-sided Squares

The pieces are made from plywood of size 3cm x 3cm. The I drilled little holes in the center of the pieces to put cylindric magnets of size 3mm x 8 mm into these holes. At last printed labels were attached at one side. 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 5x33 and 11x15.

An almost square.