As global interest in STEAM education grows, so does the demand for resources that make complex concepts accessible to young learners. Many existing books either present concepts in an overly complicated manner or, on the other hand, lack meaningful content. Furthermore, few science books provide features that effectively involve parents in supporting their child’s learning experience. This study introduces Cuby and His Shadow Friend, an embodied, game-based STEAM book designed for children aged 6–9. The book explores light and shadow concepts through interactive, parent–child co-reading. By applying embodied learning principles, the book engages multiple senses, promoting cognitive and emotional development through tactile, auditory, and visual interactions. Developed using a participatory design approach based on feedback from teachers, academics, and parents, the book features both a narrative and interactive elements, including a UV lamp to reveal hidden story details and a prism for experimenting with light refraction. User feedback suggests that these multi-sensory features successfully spark curiosity and enhance understanding, though some elements could be refined for independent use. This innovative, low-cost design fosters long-term engagement, encouraging further exploration and continued learning.