There are multiple skripts that already do that, and you are in the wrong section - this is for help only if you want something to get coded use https://forums.skunity.com/forums/requests/

But this is your solution:

Code (Text):

1. on place of stone:
2.   add location of event-block to {spawner::*}
3.  
4. on break of stone:
5.   if {spawner::*} contains event-location:
6.     remove event-location from {spawner::*}
7.  
8. every 1 second:
9.   loop {spawner::*}:
10.     spawn a zombie at loop-value

 

please mark this as solved