Zombie defence

[chills58]

maybe add a brick that if a zombie is on it, it will the the player zombies are aproaching the wall! or something? using it in my build but its not like this build

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[k772]

well they can only be by the fence there like 32 blocks that wide anf 150 brick long is the area they go in but an alarm does go of if a zombie goes over the fence.