This game combines Risk‘s land conquering with word games. The goal is to conquer the entire board by battling other armies, each with a certain number of units on a territory.
The catch is that each unit represents one more letter than can be used. So, a four vs. three battle means the four can form letters up to four letters, but the three can only form a three-letter word.
There are interesting layers of strategy here, and sometimes, knowing how to form a good short word to ward off a cocky opponent is the key to success.
Article source: http://mashable.com/2012/03/31/iphone-word-games/