Podcast, word of mouth, magazines, Reddit Lemmy?
Some from discussion on here actually, but I think mostly from gamingonlinux.com, and steam telling me “this is a bit like the other stuff you like”.
The rogue extra option, is me hoping a game exists and searching the internet to try and find if it does. It’s quite common with old unique games, where you’re looking for “did anyone ever do a remake/sequel of…”