Vladimir Krasnoukhov designed this puzzle some years ago. There are ONLY 5 pieces, how hard can it be? Some people have spent hours and hours on this puzzle. Depending on which website you visit, this puzzle is level 8 or 9. All you need to do is place ALL 5 pieces of acrylic into the tray. The square area of ALL 5 pieces added together is less the the square area of the square tray so there WILL be gaps.. There are 2 main colours black background with yellow pieces and yellow background with black pieces. If you want a particular colour please don’t hesitate to message me and ask. If I have to make a specific colour I may need slightly longer before I can dispatch your goods. Size: 140 mm x 140 mm x 6 mm Material: 3 mm Acrylic