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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 games in progress I mark as favorites, I have “Finished” and “Play Next” categories, and I have a big dump category called “Won’t Play”. Conveniently, these are alphabetical.
Aside from that, I have some big categories for collections of old games from humble bundles and steam sales, like legacy Myst, Wizardry, or Sierra games, or like Star Wars game collections.