I have a jigsaw puzzle with the following difficulties: (at least according to the box it came in)1. No “edge” pieces2. Five extra pieces that don’t fit anywhere3. Picture was printed on both sides (rotated 90 degrees)4. Picture on box does not match final product.5. 50,000 pieces (not sure if that includes the five extras)
I have had it for several years and have yet to find two pieces that go together.