Like Burn Zombie burn for the PS3 but:
-you get experience
-less treasure than normal (if possible)
-you can purchase the "Zombie Maps" from any vendor for $1
-The only way out of the Zombie wave survival maps is a town portal scroll: provided in the only chest on the map
-the room must hold at least 40 zombies including the large zombie bosses with a fair amount of movement room
-if other chests are included please boobietrap them