Play your way to number, and shape mastery with these sets of brain-teasing interactive puzzles for preschoolers. Press the included Hot Dots Jr. Light-Up Interactive Pencil to each page for an immediate light-up response.The Nitty Gritty:• Spiral-bound book with 24 double-sided tracing and puzzle cards• Perfectly portable for learning on the go• Pencil requires 2 AAA batteries (not included)