In this map, you need to survive the longest you can. In the middle of the map, you can find a place where health and other stuff spawn. Health and other stuff spawn when you kill a monster. Some monsters give you more ammunition, some less. Monsters keep spawning forever. In this version, there is no exit or any type of ending.
Added script that activates exit_normal in 1200 seconds (20 minutes). Removed pain elementals with too much health. A box of shells is spawned 150% more.
This version is much better without pain elementals