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Kotoba is a vocabulary quiz that works out what you already know, finds the words you are missing, and gets harder as you do.
About a dozen quick questions home in on the edge of what you know. No textbook chapter to pick.
A word you miss comes back a few questions later, then again over days, until it sticks.
New words arrive in the order people use them, counted across books, the web, subtitles and everyday talk.
Pick the meaning, read it in context, or fill the blank. Tap any word afterwards to look it up.