Similar to the classic word game Boggle, Ruzzle consists of a four-by-four grid of letters. Your job as the player is to use sequentially adjacent letters to create as many words as you can in 2 minutes. Words can be oriented diagonally, horizontally, or vertically, and can even change directions to form "L" or "V" shapes. Of course, what sets Ruzzle apart from Boggle is that you can compete online against players from around the world.
As you find words in Ruzzle, just swipe your finger across the letters to record them. Each letter offers a specific number of points, and some letters offer double and even triple-point bonuses. What makes Ruzzle (and Boggle) fun is that it pits you not only against other players, but also against yourself, as a major objective is to beat your own high scores. There are also Achievements that you can unlock when you find extremely high-scoring words or do exceptionally well in a particular round.
Right off the bat, avid mobile gamers will probably notice that Ruzzle appears to be a carbon copy of Zynga's Boggle-like offering Scramble With Friends. While it's certainly true that the two mobile games are very much alike, they also have some major differences that are worth pointing out.