A feature not elaborated on in the demo video is the treatment of incorrect cards. Cards answered incorrectly stay in the deck until the 3rd incorrect attempt. However, for each incorrect attempt, the possible xp earned decreases, such that getting it on first try gets 10xp, second try gets 5xp, 3rd try gets 2.5xp. Having a streak >= 3 also adds a 1.25 times multiplier.
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