With some of the most difficult, absurd, outlandish, and flat-out insane level design ever seen in the FPS genre, Extreme ROTT certainly lives-up to its name. Only hardcore fans of the base game need apply here, otherwise you're not getting far in these experimental rat mazes. Imagine if Nintendo sold one of those insanely-hard Super Mario World hacks designed to show-off TAS's as an expansion to the game itself and you'll get a general idea of what this is like.