A simple yet effective map for obtaining the Zombie Genocidest (53,595 kills) achievement in Left 4 Dead. To prevent crashes on lower-end hardware, the kill-rate has been lowered to a reasonable 72,000 per hour, which is still enough to go from 0 to 53,595 in about 45 minutes.
A simple map created for the sole purpose of killing, killng, and more killing. Don't take this map seriously. The arena houses enough supplies to last for years. The map is a great way to rid yourself of stress, or to rack up kills on certain weapons and gather Achievements wherever applicable.
Don't bother asking this to be ported to Left 4 Dead 2. The answer will always be no.