CVG:The first, an early level set in an industrial facility, showed how the refined stealth mechanics worked. With most of the areas awash in (dynamic) lighting, staying in the shadows is the key to getting through areas undetected. Bulbs can be removed by hand or shot from distance, Splinter Cell style, to make locations darker. You'll also have to keep a beady eye on the blue lozenge on your wrist, which glows to warn you when you are straying into the light and becoming exposed to enemies. Despite the increased risk, it's worth getting in close to guard patrols, though: their conversations flesh the story out, and also provide useful hints on how to progress.