My favourite puzzle series, the Impossibles puzzles from Bepuzzled with no defined edge pieces and 5 extra pieces to throw you off. : r/Jigsawpuzzles
Impossibles 1000pc Assortment (6 pc) - U. Games Australia | Educational toys, games and puzzles
Bepuzzle Impossibles Jigsaw Puzzle 750 Pieces-Impossibles- Mr. Potato Head | Michaels
Amazon.com: BePuzzled | Hasbro Candyland Game Impossibles Puzzle, Based on The Classic Game of Candyland, from BePuzzled, for Ages 15 and Up : Toys & Games
Impossibles Puzzles: A super hard-to-solve Monopoly-themed jigsaw puzzle.
Impossible Clear Jigsaw Puzzle | Transparent Puzzle | Always Personal