45. Halo
Over 50 million copies worldwide and $3.4 billion dollars later, and Halo still shows no signs of slowing down. But the original started out as something much bigger. It introduced the concept of an open world-style FPS, with vehicles and multiple paths to complete objectives as you saw fit. Stellar enemy AI, an excellent story, legendary soundtrack and of course excellent gunplay made Halo the sword with which the franchise would charge forward.















