The Melissa & Doug Vehicles Sound Puzzleis classic peg board puzzle with the added excitement of sounds. Place the Melissa & Doug Vehicles Sound Puzzle piece correctly in the puzzle board and listen to it toot, beep or rumble! Eight great sounds and a full-color, matching picture beneath the eight wooden pieces. (TIP: Puzzle has light-activated sensors; for best results, expose the sensor by removing a piece in a brightly lit room, then make the sound play by replacing the piece in the board. )