Literally Halo with a portal gun from Portal, but just adding that one gimmick makes for so much innovation in map design and gameplay strategy, haven't had this much fun playing a multiplayer shooter in years. My biggest problem is the aesthetics, guns and character designs in the game are very generic and bland and if the game had better visuals it would standout so much more, but the actual gunplay and movement are great so the gameplay makes up for the lackluster visual designs.