Love it!
No better way than to pass the time really learning some things! Its incredibly user-friendly/easy to play, helps you work on really learning words you didnt know by quizzing you on missed words again, and you can choose the level you want to play at (GRE/SAT/etc words), and you can play with others if you want. Its perfect for a quick challenge, and remembers your place on a quiz if you have to do something else. Im very happy with this app and will keep playing for a long time! Thanks!
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Vocabulary Builder by Magoosh