If the terrain cell is void space or out of bounds, a 1 is pushed to the stack, 0 otherwise.

Every 2 seconds, find a random non-void coordinate on the map and add 8 creeper on it:

GetTimer0 eq0 if
	60 SetTimer0

	1 ->isVoid

	while <-isVoid repeat
		RandCoords ->y ->x
		<-x <-y GetVoid ->isVoid

		<-isVoid not if
			<-x <-y 8 AddCreeper
		endif
	endwhile
endif