Zombie Master is a multiplayer Half-Life 2 modification, centred around a zombie-apocalypse, which throws all but one player in the shoes of human survivors. Pitched against a relentless tide of rotting flesh, they must scavenge for weaponry and equipment just to stay alive. But that one player, chosen randomly at the beginning of the round, is not bound by mortal restraints.

Human team:

* A wide range of weapons to scavenge such as shotguns, molotov cocktails, rifles and more
* A number of challenging objectives that encourage players to team up and work together
* The ability to interact with the environment to build barricades and carry objects

Zombie Master:

* Real Time Strategy gameplay; create and command your own undead horde
* A wide variation of zombie units encourages the ZM to adopt complex tactics
* Environmental "manipulates" allow the ZM to interact with the world in devilish ways