Add Yahoo as a preferred source to see more of our stories on Google. If you already know how each piece moves, then you'll play against Duolingo's character Oscar in mini-puzzles, wherein you'll have ...

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Anyone who’s taken language lessons on the Duolingo app is certainly familiar with the Duolingo owl, Duo. If you skip out on lessons, Duo will ping you — crying! — to come back. Over the past few ...