I game that my son loves to play especially in the car is what we call the blends game. I give him a blended constanant sound such as "st". One point for using it at the beginning of a word like "start", one point for using it at the end of a word like "fast" and 5 points for using it in the center like "cluster". When you get stuck you pick a new sound. Like BBDad, I'm not really sure how this game got started or what the rules are but he loves it! We also play antonyms and synonyms. Listening to us play this game in the car has even taught my littles DS2 and DS3 many new words.
Love it! Will try it out - the kids love new versions of word games. Thanks for sharing, Shari