Cortex Prime isn’t a fixed set of rules. It’s more of a toolkit, or a big box of building bricks. From a central system of dice and descriptive traits, you can assemble your own game from modular parts
The Cortex System first emerged in 1999 with an obscure game followed more notably with a series of licensed IPs in the 2000’s. Battlestar Galactica in 2007, Supernatural in 2009, Smallvilleand Leverage in 20101, Marvel Heroic Roleplaying in 2012 and Firefly in 2014.
These are all out of print and the licenses expired, and Cortex Prime was imagined as a successor that would refine the rules and all the variants (and experience in how those variants changed the feel of the game), starting from a generic book.
Previous fanworks and discussions about the ruleset had struggled because of so many rules disappearing into obscurity when the game’s license expired - so starting with the full open “toolkit” and having adaptions build on top of that was intended to allow a vast ecosystem to flourish long after individual adaptions faded away. Even if individual licensed games kept unique rules to themselves, variations could be reimagined and reintegrated into other games.
Cortex Prime kickstarted in 2017 but fell into various trouble since then. The kickstarted main handbook came out, as well as one major adaption in Tales of Xadia - but other adaptions and other work on the system languished and the property went through several owners.
I didn’t have any experience with the game before Cortex Prime - and then only late in its lifecycle - but the wide open toolkit caught my interest and inspired a huge pivot in this game’s design.
Cortex Prime would be the backing of the A Wind Age, A Wolf Age variation I playtested, but at this point I realized aspects I wanted to take different directions. Even so, while it’s not the main underlying dice mechanic, I’ve taken a lot of DNA from the system into newer designs as well.
Footnotes
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This technically marks an iteration between Cortex Classic and Cortex Plus. ↩