Contract Killer is one of those games you try out once and never put down again for a very long time. In the game you play, well, a contract killer. As an assassin you take hit assignments initially for the government but fall from your superiors graces and end up taking assignments from various shady people. Some people might get bothered by the game premise, but it's still a very addictive game to play. It was created by Glu Games, Inc., who promises to keep updating the game and adding more content and levels while keeping it all free.