A legal, zero-cost alternative: copy the vocabulary indexes from Lessons 1–25 of the Minna no Nihongo Main Textbook (available in most public library systems or via interlibrary loan) into a Google Sheet. Add furigana using the =GOOGLETRANSLATE function. Export as PDF. That is your “extra free” — and it’s entirely yours.

For a deeper dive, the Translation and Grammar Text PDF includes not just words but the context of how to use them in sentences. Breakdown of Key Vocabulary (Lessons 1–25) To give you a head start,

Be cautious of websites offering "complete PDF downloads" of the Minna no Nihongo main text or translation guides for free. These are typically pirated copies. Downloading these files is illegal and often risky, as the sites frequently host malware.