How get varibles form other scenes into one scene

[modest pewter]

i want to get a level system but i need varibles to get the levels done or not

[sterile gull]

Generally, there's 3 ways of making variables persist between scenes:

1. Place the script containing the variable(s) on a DontDestroyOnLoad object
2. Make the variable(s) static
3. Store the variable(s) on a ScriptableObject

[frigid fractal]

You can use playerprefs

[sterile gull]

PlayerPrefs are very limited in what they can store.
They also are meant to hold preferences, not game data.
And on top of that, they are not supposed to be used for caching, but for storing persistent values.

[frigid fractal]

Does static variables value reset after closing the game?

[sterile gull]

Yes they do.

[mortal gust]

3. Does that actually work on builds? as far as I know, SrciptableObjects can only be used to store values in editor, not runtime on builded game

[sterile gull]

This was about transferring values between scenes - not storing them persistently. ScriptableObjects will indeed get reset when the game is closed, even if they do keep values after exiting play mode in the editor.

[mortal gust]

Some unity answers solutions suggest that they don't even persist between scenes (on build) but I haven't tried that myself so I don't really know