How do I play Cortex? AmbyR September 24, 2020 16:39 Updated The Cortex Roleplaying Game can be played offline with friends, or online using any combination of voice, text or video. Related articles Can I try it out? How do I know I’ll want to buy it? How do I download the PDF? What is a digital sourcebook? What are the planned IPs for future releases? Is the Cortex Prime Game Handbook available offline?