As if jigsaw puzzles weren't hard enough, one consisting of entirely clear pieces now exists. The brain-melting activity is currently available from Etsy seller LittleFlowerPotShop [1], and there are four variations based on difficulty: the easiest option consists of 9 pieces, the moderate puzzle has 25 pieces, the hard has 49, and the "crazy" (aka impossibly difficult) version has 144 tiny acrylic pieces.
Pricing for the custom puzzle starts at £15 (with a £12 international shipping fee), and unfortunately — or perhaps fortunately — the two hardest puzzles are currently sold out. The seller does, however, plan on making more and restocking sometime in April. Check out photos of the puzzle, which could theoretically double as an optical illusion, ahead.