diff --git a/modules/chasing_player_module.lua b/modules/chasing_player_module.lua
deleted file mode 100644
index 76be091..0000000
--- a/modules/chasing_player_module.lua
+++ /dev/null
@@ -1,75 +0,0 @@
-------------------------------------------------------------
--- Copyright (c) 2016 tacigar
--- https://github.com/tacigar/maidroid
-------------------------------------------------------------
-
-local util = maidroid.util
-local _aux = maidroid.modules._aux
-
-local state = { idle = 0, chase = 1}
-local view_of_range = 7
-local stop_of_range = 2
-
-maidroid.register_module("maidroid:chasing_player_module", {
-	description = "Maidroid Module : Chasing Player",
-	inventory_image = "maidroid_chasing_player_module.png",
-
-	initialize = function(self)
-		self.state = state.idle
-		self.object:setacceleration{x = 0, y = -10, z = 0}
-		self.object:setvelocity{x = 0, y = 0, z = 0}
-	end,
-
-	finalize = function(self)
-		self.state = nil
-		self.object:setvelocity{x = 0, y = 0, z = 0}
-	end,
-
-	on_step = function(self, dtime)
-		local pos = self.object:getpos()
-		local all_objects = minetest.get_objects_inside_radius(pos, view_of_range)
-		local player = nil
-		for _, obj in pairs(all_objects) do
-			if obj:is_player() then player = obj; break end
-		end
-		if not player then
-			self.object:set_animation(maidroid.animations.stand, 15, 0)
-			self.state = state.idle
-			return
-		end
-		local ppos = player:getpos()
-		local dir = vector.subtract(ppos, pos)
-		local vel = self.object:getvelocity()
-		if (vector.length(dir) < stop_of_range) then
-			if self.state == state.chase then
-				self.object:set_animation(maidroid.animations.stand, 15, 0)
-				self.state = state.idle
-				self.object:setvelocity({x = 0, y = vel.y, z = 0})
-			end
-		else
-			if self.state == state.idle then
-				self.object:set_animation(maidroid.animations.walk, 15, 0)
-				self.state = state.chase
-			end
-			self.object:setvelocity({x = dir.x, y = vel.y, z = dir.z})
-		end
-		local yaw = math.atan2(dir.z, dir.x) + math.pi/2
-		self.object:setyaw(yaw)
-
-		-- jump process
-		if vel.y == 0 and self.state == state.chase then
-			local rdir = vector.round(dir)
-			local front_vec = { x = 0, y = 0, z = 0 }
-			if math.abs((rdir.x / (math.abs(rdir.x) + math.abs(rdir.z)))) > 0.5 then
-				if rdir.x > 0 then front_vec.x = 1 else front_vec.x = -1 end
-			end
-			if math.abs((rdir.z / (math.abs(rdir.x) + math.abs(rdir.z)))) > 0.5 then
-				if rdir.z > 0 then front_vec.z = 1 else front_vec.z = -1 end
-			end
-			local front_pos = vector.add(vector.round(pos), front_vec)
-			if minetest.get_node(front_pos).name ~= "air" then
-				self.object:setvelocity({x = dir.x, y = 5, z = dir.z})
-			end
-		end
-	end,
-})
diff --git a/modules/empty_module.lua b/modules/empty_module.lua
deleted file mode 100644
index df23fdf..0000000
--- a/modules/empty_module.lua
+++ /dev/null
@@ -1,12 +0,0 @@
-------------------------------------------------------------
--- Copyright (c) 2016 tacigar
--- https://github.com/tacigar/maidroid
-------------------------------------------------------------
-
-maidroid.register_module("maidroid:empty_module", {
-	description = "Maidroid Module : Empty Module",
-	inventory_image = "maidroid_empty_module.png",
-	initialize = function(self) end,
-	finalize = function(self) end,
-	on_step = function(self, dtime) end,
-})