The Cortex Plus System is a toolkit RPG system that evolved from Margaret Weis Productions, Ltd's Cortex System. It has been used for four published games and one published preview to date, and the design principles are in the Cortex Plus Hacker's Guide, a book of advice in how to create new games using Cortex Plus, and list of new games produced via Kickstarter. According to the Hacker's Guide there are three basic 'flavors' of Cortex Plus; Action, Drama, and Heroic.