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I'd say that OSR games are very low on Ludus, as both the rules and the characters tend to be mechanically simple. There isn't much system to master. Instead, the usual focus is on understanding and mastering the fictional world. The degree of Agon or Venting seems very dependent on the particular group, while Fiero is the trait that seems pretty uniformly emphasized.



I'd put the Rules Cyclopedia and Hackmaster in the OSR category (and the Cyclopedia as core to some gamers there I know).  So...   I think we'd need to talk specific games and artifacts to reach full agreement on the level of Ludus running around.

I think there might be some edge cases of OSR books with a lot of rules, but even in those cases the vast majority of the rules are hardly ever referenced in play (Hackmaster might be an exception, I haven't played that). I don't think I've ever seen a DM in an OSR game look something up in the rules, apart from spell descriptions and things like that.