Amazon is now offering two word puzzle games for Kindle--Every Word and Shuffled Row. They are free, so we encourage you to check them out.
"If you like word scrambles then Every Word is the game for you. Test your vocabulary as you try to find as many words from the scrambled letters in this fun and fast-paced word game."
"In Shuffled Row see how many words you can make from 60 lettered tiles. The tiles are added to your row one at a time so you'll constantly be working with a new set of letters. After you submit a word, the letters you used will be removed and new ones will be added. Increase your score by using less common letters. Create longer words and increase your score even more."
I just downloaded them and am going to give them a test run.