1. INTRODUCTION
Analysis of gameplay data is an important component of the game design process. Play testing helps game designers know what players are doing in the game and whether or not this behavior is expected [9]. These insights help game designers evaluate design decisions and iteratively improve the game. However, thorough evaluation of a game's structure is challenging because it often requires finding patterns in high-dimensional data from many players. Game companies spend a lot of time and money on play testing, resulting in a need for data analysis methods that are efficient, powerful, and easy to use.