In this gif, I'll show you how valves work. Easy to understand but difficult to use. We only see one wall of the room at a time. We need to rotate the valve to rotate the perspective of the camera. This way we can see another wall. There may be some doors to walk to the next room. Or may be there will be something terrible... https://ldjam.com/events/ludum-dare/48/ventil-of-view