this may sound like a dumb question. But i’m making a fps game and i want to now what is the best way to find the minimum and MAXIMUM Requirements for your game. (sorry if my english sucks, also i’m new to the game development universe)
Normally I’m working on mobile, and I have a few devices to test on. Mainly I test on a Samsung Galaxy Tab 3 7.0, which is a very low-powered Android tablet. If my game can run on that, I know it will run on pretty much anything else. I recently got a Nvidia Shield K1 for Christmas (Yay! 
), and that’s one of the most powerful mobile Android devices you can get. Also it has a cool feature where you can set how many cores (2 or 4) to run your app, along with maximum usage percentage (50 - 100). One of my close relatives got a Moto G4 Plus a few days ago, so that’s a mobile phone I can test on as well. So having a wide selection of devices is pretty crucial.
As for PC, you’d have to test your game on different devices or try underclocking your CPU/GPU if possible. I can imagine you could even put your game on a flash drive and go to a electronics store like Best Buy or Micro Center, copy it over and test on their computers (since they have a wide selection). Or you could post it online on cloud storage (OneDrive, Dropbox etc…) and download to a computer or mobile device there. As for a Maximum requirement, do you mean how to find the minimum hardware needed to run on maximum settings? Because normally the more powerful a device, the better.
If you can’t access other devices for some reason, I guess your only other option would be to get the game installed on beta testers’ computers and collect results (either thru surveys or analytics). However I’ve never had a problem using a store’s display device as they want you to use them enough to buy one.
Thank you! Good luck with your games