It's exciting to place all nine pieces correctly in the puzzle board and hear Engine #6 race to the rescue! A full-colour, matching picture is beneath each piece. Light-activated sensors trigger high-quality recorded sounds from the built-in speakers. Children will "fired up" with matching and listening skills while playing with this attractive wooden puzzle from Melissa & Doug. This sound puzzle encourages problem-solving skills and independent play. For children ages 3 years and above. Two (2) AAA batteries required (not included).