The technical term for this is Speed Running and some people take it to extreme, like this Portal Done Pro. Less than 9 minutes 30 seconds for the WHOLE Portal game!!!
Now, as I say that’s an extreme and it uses exploits and holes in the map, but the concept is still the same as mere mortals like you and me, when we try and get through a map as quickly as possible.
Now, I have to admit that quite a few times I have run around a bunch of zombies, but I don’t get much pleasure just avoiding enemies and missing out on all the fun.
What about you?