What would it be like to have an additional stage below ghost for those cards that are really a big struggle?
My thoughts are to have a ‘Demon’ stage where if you constantly get ghosts wrong constantly, they turn into demons and after that you would have something like:
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Extremely short intervals i.e. 1 minute, 5, 10, 30, 60, 120 until you reach the 4 hour interval for Ghost 1, so 6 stages.
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Have the requirement to pass every sentence availible for that specific word or grammar point, before the demon is slain.
Demons would be very hard to progress to help you make your weakest points the strongest.