Can I use /testfor on zombies?
Zombies are entities, and entities can be detected by type. To test for zombies:
/testfor @e[type=zombie,x=value_here,y=value_here,z=value_here,r=value_here]
Zombies are entities, and entities can be detected by type. To test for zombies:
/testfor @e[type=zombie,x=value_here,y=value_here,z=value_here,r=value_here]