Journey under the sea with Buster and Lass for a special counting adventure from 1 to 20! It's fun and different. Can your child find and count the new friends as they arrive? You bet! Perfect for ages 6 months to 6 years. Focuses on the numbers 1 to 20.In this Big Book edition, we've included the story in full and standard editions, fun extras that allow children to meet the critters and explore Bugville, and 3 sets of flash cards for practicing counting and numbers.