Petit Collage Monster Party Decoder Puzzle.100-Piece Puzzle from Petit Collage has thick, sturdy pieces that are just the right size for little hands. Featuring a bright and fun illustration, this is more than just a traditional jigsaw! Once the monster puzzle is completed, children can put on the included magic decoder masks to find the objects hiding in the silly scene. Building puzzles promotes hand-eye coordination and the development of problem-solving skills – plus, it’s a lot of fun!