that's a pretty funny game if you have mates to play with, i play it sometimes with some Bks (zmei, eypo, chris, dangel, gust & piba)
there are some custom maps if you want, we found those:
http://www.l4dfrance.fr/t%C3%A9l%C3%A9chargement?quicktabs_2=2#quicktabs-2click on "lire la suite" to see the details of the maps, then on "télécharger" (=download)
ps: don't play with eypo, it looks like....
eypo: oh a button!
others: NOO no no no DON'T TOUCH
eypo: *press*
others: oooohhh fuck
eypo: oops they're coming (he runs in toilets with his chain saw)
others: