Out of the countless iPhone games available, it's often tough to find the ones that are actually worth checking out. Well, Overkill is one game that's definitely worth downloading. Developed by seven man-developing studio, Craneball Studios, LLC; the game is fast gaining steam. In fact, as of March 20th this year, it has become one of the most downloaded free game on iTunes. Some of its biggest draw include fantastic graphics, awesome gameplay, and best of all, it's offered absolutely free. The game is perfect if you need some stress buster in between breaks or simply if you want to inject some fun and chaos into a boring afternoon.