int zombies = 5;
	@EventHandler
	public void onEntityDead(EntityDeathEvent e) {
		Bukkit.broadcastMessage(ChatColor.GREEN + "YEAH");
		if (e.getEntity().getType() == EntityType.ZOMBIE) {
			zombies --;
			if (zombies <= 0) {
				NextLevel();
				Bukkit.broadcastMessage(ChatColor.GREEN + "YEAH");
		}