Misunderstands excellence
This app is addictive but when you play at the highest level of difficulty, the designers make it hard by two strategies that are unrealistic. First, when the app gets behind badly, it is almost inevitably given a bonus word combination. Second, and worse it becomes obvious that the letters you have on your rack are known by the opponent bot. Often the bot “takes chances” no advanced player would do because it obviously knows what letters you have. Pretty chintzy, but still fun to play.