There’s a world of games out there, but they still just scratch the surface. Maybe your favorite book series or movie hasn’t caught the eye of anyone making RPG adaptations. Maybe you have your own spin on a popular genre that you just can’t pull off with an existing game. Or maybe you just want to run something wild and straight from your own head. No matter the reason, if a game off the shelf doesn’t quite do it for you, you’re looking for a generic RPG.

We’ve talked a bit about generic RPGs before, reviewing Cortex Prime and Everywhen, discussing Fate, and even using GURPS as an example text for looking at how to use generic games. This article is less about what to do with generic games, though, and more about how to find the right one for you. We’re going to discuss three broad types of generic games: Engines which are designed to model as many situations with as few rules as possible, Codexes which use a simple base ruleset and then expand it with a wide library of additional mechanics, and Chassis which take more traditional setting-driven RPGs, strip out the specific parts, and then (hopefully) build back up to something useful. The ‘Chassis’ generic RPG is the most common and popular, but the other two design modes may very well have more to offer the prospective game master.