Handwritten Four-Character Idioms: Test Your Knowledge is an educational app developed by StudySwitch Inc. It features a collection of 1000 four-character idioms commonly seen in entrance exams, Kanji proficiency tests, newspapers, and books. With six levels ranging from elementary school to enthusiasts, the app challenges users with all 1000 problems. Aim to conquer all 1000 idioms and improve your knowledge!

This free app, Handwritten Four-Character Idioms: Test Your Knowledge, displays ads as it is supported by an advertising network. StudySwitch Inc., the developer behind this app, is known for providing numerous educational apps, with the "Hanpuku" learning series exceeding 30 million downloads. For any issues or feedback regarding Handwritten Four-Character Idioms: Test Your Knowledge, users can contact the developer through the in-app contact form.