What happens when Louis plays Left 4 Dead (Gmod Machinima)

SORRY ABOUT THE GREY PARTS! MORE INFORMATION BELOW! I had to zoom in or else there would be those tools describtion , baaah , what do you think? Shall I just keep it like this , or should I just show the tools describtion? Todays questing: What map is Louis playing? Prize: A free copy of my homework (Sold at ebay , delivered by sandwiches)