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I'm mildly proud of how I categorise my games on Steam and interested to see others' methods
(feddit.nl)
They're in order of likelihood of being played. Craig is a mate of mine who I play with when time permits.
The ones that have a lighting are dynamic. You know how when you go to search in your games it lets you filter to get only the ones with the rpg tag, or multiplayer, and so on? You can create a category that has all the games with the rpg tag, which updates dynamically. When you go to create a category it gives you the option, it should be straight forward.