Subsonic
Subsonic takes the whole idea of stealth games a bit further. Normally, when you play games like this, there's usually some device that you use to keep your noise level down. Whether it's as simple as footpads or some hi-tech gadget that cushions your footsteps, hardly anybody in the game world has ever thought of actually creating a gadget that sees soundwaves. Well, until now, that is.
In Subsonic, you play an agent for a group of merceneries who specializes in sound technology. Equipped with your sound-vision goggles, your task is to finish the objective for any particular level and get out alive.