Shuji Cards is a flashcard memory game based on Graduated Interval Recall, where questions to both correct and incorrect answers are repeated according to a graduated interval pattern. Originally designed to help learners memorize Chinese simplified characters in preparation for HSK level exams, it also has other flashcard decks for Math and Spanish. Users can modify the sequence of cards, as well as the content of decks (hide/show). Sound files for pronunciation of answers are also provided. Minimum requirement of IOS 12.0