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What is a good scrabble game software for Windows? One that has good graphics (that doesn't look like some very old game in the past) and many features (with support for multiple players) and/or includes other word games on it (optional)?

What's the difference between Scrabble app that's free and for a fee? I downloaded the free Scrabble app on my itouch but see one that costs $2.99. Is there a difference between them?