Far Cry Primal
This game takes the concept of prequel too far - set in the pre-historic central Europe, where man is still fighting the forces of nature to become the dominant species on Earth. This first-person sandbox trades guns for pre-historic tools/weapons, with which you can hunt, gather, and tame wild beasts.
Based on Ubisoft's latest Dunia Engine, the game takes advantage of DirectX 11, and is heavily taxing on high-end GPUs.