Practice writing numbers with Blue and friends with 4 counting-themed reusable boards and refillable water pen Reusable pages are white when dry, reveal colors when wet; search and find activities on each page Makes a great gift for preschoolers, ages 3 to 5, for hands-on, screen-free play Chunky-size water pen is easy to fill, easy to hold, stores in pad; compact, spiral-bound format - great for travel Blues Clues & You! promotes kindergarten-readiness, inspiring confidence, empowerment, and kindness in preschoolers as they develop their problem-solving, social, and developmental skills through play Ages 3+