how to load an attribute after you exit the game

Good evening, I have this problem:
In the game I'm creating, you have to unlock levels, to proceed.

Start the game, unlock the first few levels and all things proceed.
But when I close the game and reopen it, I had those levels are unlocked again blocked.
How can I save levels I unlocked, so that when I open the game, even after it is closed, I find levels unlocked?

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