TDC Games Killer Cupcakes Jigsaw Puzzle - 500 pieces - Double Sided

This puzzle was an extremely poorly made puzzle. I had to glue 75-85% of the pieces on the edges, and when I took it apart some of the unglued pieces separated, so, I will have to glue the rest of them the next time I put it together. There were several I did not glue because I just got tired of having super glue all over my fingers and finger nails and having the pieces stuck to me and pulling the color off of the puzzle. This company needs to use sharper cutters when cutting their puzzles and use better quality cardboard (no so many layers). I can put up with a few frayed pieces, but not the amount this puzzle has. The puzzle box says "World's Most Difficult Puzzle" but, I did not find it that difficult at all. If it wasn't for all the piece's coming apart and having to be glued, I would have finished this puzzle in about 10-12 hours. The double sides did not pose a great challenge for me. I usually work 1000-2000 piece puzzles. I only got this 500 piece because I thought the double sided pieces would make it very difficult to put together and I have always wanted to try to put one. Was to much trouble and expense for the quality of the puzzle. I have had only one other puzzle that was this poorly made, and I have about 25-30 puzzles.