Zombie Master is an RTS/FPS where survivors (fps) are set to do certain objectives while trying not to get their arse kicked by the zombie master (rts).
The survivors get a number of weapons:
Pistol
Shotgun
Rifle
Smg
Crowbar
Sledgehammer
Fists
While the zombie master, gets to spawn zombies to do his bidding:
Shambler: Your average slow zombie who can destroy blockades
Drifter: These are great support zombies, low damage but can seriously distort your screen making you a sitting duck at the right times.
Hulk: Obviously, this zombie is a big ass fucker who hits like a truck and takes lots of hits.
Banshees: Fast zombies who can pounce on you, a group of these on a lone survivor should either kill them or take a chunk of damage from them.
The zombie master also gets a number of tools to use like physics explosions to send props flying in the distance, or an ability to spawn shamblers anywhere as long as they are out of sight of the humans.
http://www.zombiemaster.org/
It would be a wise idea to check out this guide:
http://www.zombiemaster.org/smf/index.php?topic=593.0
Now go spam some hulks!