Saves are made as soon as there's no more actions in the queue. It's sadly impossible to save right before doing an action, and saving on flip would be more annoying than helpful.
When you undo, all cards will be in the state the last action left them in, and will need to be flipped again if that wasn't saved
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When you undo, all cards will be in the state the last action left them in, and will need to be flipped again if that wasn't saved