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 imagine an undersea adventure and count the new friends as they arrive? You bet! This Bugville Jr Learning Adventure, written by best-selling author Robert Stanek, is designed to build number sense and 1 to 20 counting skills. For absolute beginning counters, you may want to look for “Buster’s Undersea Fish Counting Expedition 1 to 10” instead.