Version 2.0 Final allows the Big Brother to alter the environment in real-time to funnel the player. Doors that were previously open will suddenly lock, forcing the player into narrow chokepoints. Light sources will flicker and die not by random chance, but strategically, when an enemy is approaching. The weather system is tied directly to the player's inventory: if you have thermal optics, the Big Brother will initiate a dense fog or a radioactive storm to render your gear useless.