4. Left 4 Liberty: Infection
The next modification to appear in our countdown is the Left 4 Liberty: Infection mod from GTA IV. Trying to survive the streets of Liberty City is hard enough when you have gangsters and police officers hunting you down, but imagine just how hard it would be if, around every corner, the living dead were lurking, keen to eat your brains and turn you into one of them. This mod is basically a game of survival as the zombies attempt to infect you, as each time you are injured your infection percentage will rise. The mod also has six different in-game meters - Infection, Health, Armour, Vehicle, Speed and Fuel. If zombie killing is something you enjoy, then this mod is definitely for you, combining two of the best video game franchises out there.