I always used https://www.bibme.org/ to keep track of my citations. When you're writing papers for two classes or have a longer term paper done using this can be extremely helpful. Also, if you have to do an annotated bibliography you can add your annotations in the page and it is a nice copy paste.
sourcing is very important for all things college:
Whatever argument or point you are trying to make just needs to be source and those sources lead to your logical conclusion.
Something to keep in mind is generally whatever you are doing there will be a primary text associated with it. For example Adventures of Huckleberry Finn by Mark Twain. From that primary document there are documents that explore the primary document, and equally documents that explore mark twain and his influences. Further if its more academic document, such as a history, that document will have sources you can explore and expound your point.
Now this does sound like HS writing a bit, but here's the thing: college writing is bringing your point across. Its like writing an opinion but its not an opinion if it has enough sources to say what you are saying is indeed true. For example: Mark Twain was a drunk and that shows in his writing and life. His stories are tainted with the haze of liqour and perhaps should be discredited.
Is that true? Maybe. If you found sources that can support this point then you have something and can keep writing it. If all your sources say the opposite then you don't have something, but you might discover something else in those sources that might be interesting to present to your professors and the class.
Bibme.org will help you cite in MLA or APA format (or Chicago if that's your jam). It will also help with grammar and punctuation if you need it. I used it a ton in university.
I feel like you would either cite it as software or as a modified version of film. Whichever you choose, I definitely would not cite individual people unless you are specifically citing a particular part of the game (for instance Nintendo soundtracks and Koji Kondo); the "author" can be Nintendo or whatever Nintendo subsidiary developed it.
Check out this: https://www.bibme.org/mla
I believe the information on citing within containers might be applicable, although I don't see why you wouldn't cite it like a normal website. I suppose it depends on what you're doing and how you apply it.