#flashing lights
or really all options would be good, but this in particular. The current heuristic seems to be "if you google game + accessibility and there's no results, the answer's probably no", but that's not a great solution.
For example, I have a hard time dealing with flashing lights (nothing serious as far as I know, they just make me dizzy and nauseous, but enough that I can't play a game and have to look away). This is fun because "make thing flash a lot" has always been very easy to program and is right there in the core vocabulary of video gaming. So I keep seeing games that look interesting but with gameplay footage that makes it obvious I won't be able to play parts or all of it without hurling - unless there's an option to Make It Stop. And some games do have options to help with that! Which would quite probably be helpful for me! But there doesn't seem to be a standardised way of finding out other than like, download the game and see if the option is there.
Obviously the other thing is "games should generally have actual accessibility options in normally", which is the other problem, but it would at least be nice to know the option is there when it is.
(There is, to be fair, a website called Can I Play That that is doing some work towards documenting and looking into game accessibility, but as a small group of people they can't look at every single game and why should it be down to them.)