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save some values even when the user exit the application

hi, i want to make an AR game, and this is the description of my game:

the user will have to search the trakable in one area. each trackable will give some scores. the user will get a reward if his score is bigger than the score that we specify before.

i wondering something, can we save the score value even when the user exit the application? for example, the user suddenly got bored and want to exit the app, but he want to play it in another minutes and don't want the score back to zero again. how can i do that?