Right now I'm making a game for PC, based on classic game emulators, and it would be nice to make the user play with some "specific" mechanics.
Like, for example, if I could detect my user's pc resolution I could make it so you can't go over X part because you need a lower screen resolution. Or a part where you can't progress while on fullscreen.
Or maybe detect when the mouse is plugged or not, when the user is recording the screen, when there's a keyboard or a joystick plugged. I don't know! Any kind of these unusual triggers would be nice to have, and they probably are, but I don't know where they are or how much there are.