This document discusses using data-driven analytics to optimize game retention. It shows data on retention rates for different mobile game categories, networks, and platforms. The top performing mobile games are ranked, and iOS is shown to dominate Android in overall retention for some categories. The document concludes with best practices for retention, such as using easy initial levels to engage new users, implementing notifications strategically for different player types, integrating social features to build community, releasing timely updates, and paying attention to reviews and ratings.