Bioshock Infinite
An early frontrunner for 2013 "Game of the Year," Bioshock: Infinite pulls gamers out of the depths of Rapture and into the heights of Columbia, a bustling metropolis of the early 20th century that floats in the sky, with buildings and localities that are interconnected through bridges and cable cars. The shooter is renowned amongst critics for some genuine innovation in gameplay mechanics, the proper handling of NPCs, and a story that will linger long after you've finished the game.
Based on a retrofitted Unreal Engine 3, Bioshock Infinite takes advantage of the DirectX 11 API and should tax most GPUs moderately.