A screen shot of doom (from doom3.com). In the game you are a marine that has to find his way around Mars wihtout getting eaten (or whatever those demons want to do). After a few steps you don't want to go around the next corner anymore, because you know that something terrible is waiting there for you. Or maybe around the corner is nothing? It is dark.. most of the time and you can either see or shoot but not really both at the same time!