Kana Mind: Katakana & Hiragana!

Kana Mind is free, has no ads, and no in-app purchases of any kind. It works an educational game that helps you learn to recognize the symbols used in Katakana and Hiragana (collectively called Kana), the first two alphabet styles used in the Japanese language. But since it doesnt teach you Japanese grammar or vocabulary, its intended to be used as an aid to an ongoing Japanese course.