How to save without playerprefs?

Hello, I am creating a 2D platform game and I have added a coin collecting system. I would like that when you collect a coin, if you finish the level and come back to it, the coin is not there anymore. By default unity reset a scene when we leave it, I can't use playerprefs because I can't create one per room, do you have a solution to my problem?

 

one potential way to do saves without playerprefs is to write text files using StreamWriter and read it back out using StreamReader (those are both basic c# System.IO classes)

you can base the path you write your save data to on Application.persistentDataPath, this is where most smaller games save their save data and this path works on most systems

furthermore you can serialize and deserialize data with json utility (https://docs.unity3d.com/Manual/JSONSerialization.html) with which you can convert an object of a class to a text file (ToJson()) and create from such a text file your object again (FromJson<class>())
this only works for serializeable fields though (in other words, works well if the object is defined by numbers and text, wont work for most other things unless you write your own Serialize and Deserialize function)

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though i gotta say, i dont see why you cant use player prefs... you can just create the keys dynamicly during runtime since they are just string:

like PlayerPrefs.SetInt("RoomKey"+roomindex; theValueYouWannaSave)

 

I made it with playerprefs, i found the solution thanks you.