The purpose of this study was to develop an educational play tool (APE) called “Rumah Nusantara Mini (RUNAMI)” for early childhood education, specifically for Group A (children aged 4-5 years). The research method used was Research and Development (R&D) using the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The results of the implementation showed that RUNAMI was very effective and feasible to use as an interactive learning medium in introducing Indonesian cultural diversity and stimulating holistic developmental aspects of early childhood, including religious and moral values, physical-motor, cognitive, language, social-emotional, and art aspects.