The rules of the game are simple: in the beginning a word is selected at random which the first player then must draw. The next person guesses what the first drew. Then it's back to drawing and in the end you can review the game, mock your friends for the horrible abominations they drew and brag about your own Picasso-like drawing skills!
You can either choose to join somebody else's lobby and jump right into the game without any preparations or create your own which you can customize (like picking the topic and words to draw) and for which you set the rules!
Please note that due to this being a multiplayer game an internet connection is required.