I know that music! It's from Newgrounds and used in that awesome Flash game Age of War!

I wish I had the Left 4 Dead games. I'll play some Age of War instead.

Made it on to the Castle Crashers soundtrack, too.

Nice scripting work, I can see a problem though. Since the nav can't be rebuilt dynamically, most of the AI won't know how get over your built objects. Might make it too easy.

Needs work i know.

Also, no scripts or plugins. ALL MAPPING ENTITIES!

Oops, that's what I meant. It's impressive you did it all with I/O.

wish i had l4d2 so i could understand the full implications of this, but since it's from you, i'll rest assured it's amazing work!

)

Awesome, didn't even realise it was possible to do that sort of thing. Can't imagine the repercussions like navs as Strider pointed out.