From the front cover: Cortex Prime is a multi-genre, modular, session-centered roleplaying game. It’s based on the same underlying rules system previously used in several award-winning RPGs based on comic books and television shows. These games were different from one another in ways both major and minor, yet the heart of Cortex was evident through all of them. With the Cortex Prime Game Handbook, you have the tools and resources to create your own custom-built game using a myriad of switches and dials, and with the Cortex Codex, it's now easier than ever.