to save progress, you will use a code based save system. you go to the main menu, go to options, press save and copy the code, then to load the game go to the same options menu, and press load and paste your code and you have your data back. atleast thats what im thinking of it being. I could also make a cloud based save system using a cloud list to save data. each player has their own slot in the list and if it is a new player a slot will be added. actually maybe ill make an account system and to save all you have to do is log in with your own credentials such as username and password and you can save your data automatically!
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and to make the account system i can use a list of usernams and passwords registered into the gme, and if the username and password are the same slot meaning thats the password assigned to the username, then you sign in and the game retrieves your data from another list automatically loading it and it saves automatically all the time.