Although Underbelly is the easiest level on any difficulty, I hate all the backtracking. Wild Things and Desperate Times tie for favorite places to see. The cops helping for a while was a nice touch and I always wanted to see zombie animals since dogs and monkeys were the norm.
End of the Road got some points for desolate atmosphere, but there were so many unnecessary additions, like the frigging landmines.
I want to like Flashback, but between the invincible Axeman and the super fast plants, I can only take so much of that level at once.