The HITN Early Learning Collaborative (ELC) PlayGround initiative stars Pocoyo and his friends in thematic suites of standards-based teaching and learning materials. The transmedia PlayGrounds support three-to-five-year-old dual language learners (DLLs) in three main areas: English language development, early literacy, and math skills. Proven effective through rigorous summative studies and funded through a federal Ready to Learn grant, the ELC transmedia PlayGrounds are now in the hands of children, parents and teachers across the United States and Puerto Rico. The digital and non-digital materials address diverse learning needs across multiple interconnected platforms, promoting collaboration and skill-building, and engaging children in learning through play.