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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.
No test to sit first: say roughly where you are and go. Your first rounds find your level; a four-minute check gives an exact count whenever you want one.
A word you miss comes back a dozen 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.