When you use the button to go back from using a card, it's very easy to back one too many times and erase your current game. confirm
Confirm you want to go back to the menu and lose your current game before going back, or at least trigger an auto save so you can get back to your game.
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Ben
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All single-player games now automatically save, so if you accidentally leave the page or close the app, you can always return to the game and pick up where you left off.