At the StampedeCon 2013 Big Data conference in St. Louis, Riot Games discussed Using Hadoop to Understand and Improve Player Experience. Riot Games aims to be the most player-focused game company in the world. To fulfill that mission, it’s vital we develop a deep, detailed understanding of players’ experiences. This is particularly challenging since our debut title, League of Legends, is one of the most played video games in the world, with more than 32 million active monthly players across the globe. In this presentation, we’ll discuss several use cases where we sought to understand and improve the player experience, the challenges we faced to solve those use cases, and the big data infrastructure that supports our capability to provide continued insight.