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Tobira: Gateway to Advanced Japanese Power Up Your Kanji is a resource recommended to be used in addition to the Tobira textbook. It focuses on the kanji you learn in the textbook and provides additional information and practice for them. After you finish the Tobira books, you are supposed to be able to read and write 800 kanji: 297 beginner kanji reviewed in this book & 503 new kanji.
Tobira: Gateway to Advanced Japanese (Learning through Content and Multimedia)
Tobira Grammar Power: Exercises for Mastery