Sounds like a great idea! Sounds are played when the puzzle pieces are properly placed on the board. It is a fun and unique way to reinforce cause-and-effect, early vocabulary and matching skills. The Train Sound Puzzle offers a great way to teach youngsters about cause and effect and challenge their young minds to problem solve as they piece together this locomotive puzzle. Kids will be all aboard for hours of fun with the Train Sound Puzzle from Melissa & Doug! Requires 2-AAA batteries, not included. For ages 2 and up. Size: 12" x 9".