I would never assume such a thing as "everyone has played Slay the Spire", an obscure proprietary game with a famously hyperfocused audience of obsessive players and an absurdly high difficulty curve
I would of course *instead* assume such a thing as "everyone has played Dungeon Crawl Stone Soup" an obscure *open source* game with a famously hyperfocused audience of obsessive players and an absurdly high difficulty curve