>and episode 4 This is where my playthroughs really grind to a halt. episode 4's levels were primarily designed by Sandy Peterson, who is also responsible for

>and episode 4 This is where my playthroughs really grind to a halt. episode 4's levels were primarily designed by Sandy Peterson, who is also responsible for some of Doom 2's more infamous levels. He seems to like very large, difficult to navigate levels with painful traps. It's in total contrast to the tight, iconic levels of episode 1.