Zombie Hordes

This is a mini game I made for my RPG server legendofmc.net. this is a dungeon in the coal mine. You have to kill the zombies plaguing the coal mines. You click a button to spawn in zombies and you can keep clicking it for more zombies. You sell the rotten flesh to a villager in the arena for gold nuggets (The currency on legendofmc.net). You can also click a button to quit and go back to spawn. Please go on the server it is on legendofmc.net and do this dungeon!