By the time I finished Call of Duty: Advanced Warfare's single-player mode, I wanted to return to Seoul, South Korea, the setting of the game's first chapter. This mid-21st-century metropolis is awash in ultra modernity, to a degree I haven’t seen since visiting the economically prosperous version of Tokyo in the 1980s. It's the perfect futuristic backdrop to introduce Advance Warfare's new movement abilities, which are granted by the soldier-enhancing exosuit introduced in the campaign. And when you first bear witness to a flying giant snake made up purely of small drones roaming the streets of Seoul, you know this is new science-fictional territory for Call of Duty.