No, I don't mean that you should use words that you don't understand, I'm talking about online word games. My favorite site for word play is a Vocabulary one. And I quote:
Playing with Words
Having fun with words begins at an early age and continues through the years. From Shakespeare’s quibbles to Twain’s colloquialisms, word play is an important part of language development at any age. Whether doing a crossword puzzle or playing hangman, kids love increasing their vocabulary through fun word play games online.
Word play games are an excellent way to practice spelling, increase vocabulary and keep the mind sharp.
Actually, you should be careful what words you play with!!!! Many writing games are fun but my favorites are Scrabble, You've Been Sentenced, Words with Friends, and Hang Mouse.