Learn Hiragana and Katakana by fighting monsters in fun RPG battles.
Flashcard Clash uses the spacing effect to make learning as efficient as possible, by showing cards you get wrong more often and cards you get right less. So you don't wast time on things you already know.
To mix things up and keep it interesting, some cards can be dynamic, changing each time you see them. Eg: The first time you see a card it might be "The fish was polite" but the next time it could be "The cat was polite" or "The dog was unpleasant". This forces you to really use what you have learn to read the card, rater than rote memorizing the same meaning of the one sentence.
Level up to defeat the boss and move onto the next area.