Amazon.com: INOVART Puzzle-It 16-Piece Blank Puzzle, 24 Puzzles Per Package, 4" x 5-1/2", White : Toys & Games
15+16 PUZZLE - Logica Puzzles
15 puzzle - Wikipedia
16 white puzzles pieces arranged in a square. Jigsaw Puzzle template ready for print. Cutting guidelines isolated on white Stock Vector Image & Art - Alamy