Gradient Puzzle: Jigsaw with gradual color shift from blue to green
Hardest jigsaw puzzles: Up to 2000-piece puzzles for adults | The Independent
Amazon.com: Cloudberries Gradient Puzzle: Hard 1000 Piece Jigsaw Puzzles for Adults, Rainbow Puzzle with Fun Color Gradient, 1000 Piece Jigsaw Puzzles : Prime Video
Gradient Puzzle Large (pink/yellow), 1000 Pieces, Areaware | Puzzle Warehouse
Jigsaw Puzzles – Tagged "Gradient" – The Puzzle Nerds