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Uploaded on Nov 15, 2010
50 frames per second!
Mutations are OFFICIAL tweaks and changes to the normal game rules and were playable for 2 weeks! (Now it's player defined) These mutated gameplay modes are listed under "Mutations" in the game!
In this MULTIPLAYER Mutation, the Survivors do not have permanent health. Once they load up, they will have 100 temporary health, which will tick down slowly, but surely. First aid kits will never spawn; only Pain pills and Adrenaline shots. Survivors must keep moving. Once their health drops to 1, they will move at a slow walking speed and be extremely vulnerable to any Infected. More info here: left4dead.wikia.com