My thought is at the minimum you should be able to say "X RPG, any edition" and "X RPG, these editions only" - my thought is a lot of people would play AD&D 3rd and 5th editions but not 4th, or at least they say that online :)
Relatedly you can have campaign settings as well, AD&D certainly has several but the official/custom split potentially applies to any game with its own setting. Could just be handled by tags though.
Relatedly you can have campaign settings as well, AD&D certainly has several but the official/custom split potentially applies to any game with its own setting. Could just be handled by tags though.