With minimum requirements calling for Windows Vista 64-bit, a 2.0GHz processor, 2 GB of RAM, a GPU that can handle Shader Model 3.0 and 13 GB of space, Nightmare Edition shouldn't be too taxing for your gaming rig. Recommended specs jump up a bit, calling for an Intel Core i5-2400 Processor, 8 GB of RAM and a NVIDIA GeForce GTS 450.
The $20 Nightmare Edition adds a difficulty mode, includes the Smooth Operator DLC and offers a theater to re-view cutscenes. Aside from its uncomfortable Gigolo side missions, we'd recommend giving Killer Is Dead's bizarre brand of combo-driven action a shot.
Killer is Dead: Nightmare Edition