It's basically scrabble, you can play with your friends who also have iPhones (or random opponents if you so choose)
If you close out the app it doesn't end your game, which is the best part. My friend Allison and I just finished a game we played off & on yesterday and last night.
If you wanna play my username is ChelseaRayHey just invite me! It's so fun ha! (And yes, I did just get 57pt word!)