Difficult Monochromatic Optical Illusion Jigsaw Puzzle
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![Difficult Monochromatic Optical Illusion Jigsaw Puzzle Difficult Monochromatic Optical Illusion Jigsaw Puzzle](https://rlv.zcache.com/difficult_monochromatic_optical_illusion_jigsaw_puzzle-r_vsev1u_500.jpg)
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This monochromatic jigsaw puzzle with a pattern of diminishing circles that creates an optical illusion of contoured waves of grey circles and black diamonds is a very difficult and challenging puzzle that will give hours of fun.