diff --git a/bl_tutorial/src/entities/ball.lua b/bl_tutorial/src/entities/ball.lua
index 98fd5eb..8dafea5 100644
--- a/bl_tutorial/src/entities/ball.lua
+++ b/bl_tutorial/src/entities/ball.lua
@@ -16,8 +16,8 @@ local ball = {
     static_save = false,
   },
 
-  p_name = nil,
-  timer = 0, -- solo per farla beccare da block_league.get_ball
+  _p_name = nil,
+  _timer = 0, -- solo per farla beccare da block_league.get_ball
 
   on_activate = function(self, staticdata, dtime)
     local ball_obj = self.object
@@ -61,7 +61,7 @@ function ball:attach(player)
   local p_name = player:get_player_name()
   local arena = arena_lib.get_arena_by_player(p_name)
 
-  self.p_name = p_name
+  self._p_name = p_name
 
   arena_lib.sound_play(p_name, "bl_crowd_cheer")
   block_league.HUD_ball_update(p_name, extS("You've got the ball!"), "0xabf877")
@@ -78,7 +78,7 @@ end
 
 
 function ball:reset()
-  local p_name = self.p_name
+  local p_name = self._p_name
 
   -- annuncio
   arena_lib.sound_play(p_name, "bl_voice_ball_reset")
@@ -87,7 +87,7 @@ function ball:reset()
   local wielder = minetest.get_player_by_name(p_name)
   local ball_obj = self.object
 
-  self.p_name = nil
+  self._p_name = nil
   wielder:set_physics_override({speed = block_league.SPEED})
   wielder:get_meta():set_int("bl_has_ball", 0)
   ball_obj:set_detach()
diff --git a/block_league/src/HUD/hud_broadcast.lua b/block_league/src/HUD/hud_broadcast.lua
index 17b9c59..60701f5 100644
--- a/block_league/src/HUD/hud_broadcast.lua
+++ b/block_league/src/HUD/hud_broadcast.lua
@@ -59,7 +59,6 @@ end
 ----------------------------------------------
 
 function remove_message(panel, field)
-
   local old_msg = panel[field].text
 
   minetest.after(3, function()
diff --git a/block_league/src/game/TD/ball.lua b/block_league/src/game/TD/ball.lua
index ee2292e..3d2f99e 100644
--- a/block_league/src/game/TD/ball.lua
+++ b/block_league/src/game/TD/ball.lua
@@ -21,14 +21,13 @@ local ball = {
     use_texture_alpha = true,
 
     textures = {"bl_ball_unclaimed.png"},
-    timer_limit = 10,
   },
 
-  p_name = nil,
-  team_id = nil,
-  timer_bool = false,
-  timer = 0,
-  has_scored = false
+  _p_name = nil,
+  _team_id = nil,
+  _timer_limit = 10,
+  _timer_bool = false,
+  _timer = 0
 }
 
 
@@ -36,14 +35,13 @@ local ball = {
 -- eseguito quando l'entità viene distrutta
 function ball:_destroy()
   self.object:remove()
-  return
 end
 
 
 
 function ball:get_staticdata()
   if self == nil or self.arena == nil then return end
-  return self.p_name
+  return self._p_name
 end
 
 
@@ -51,7 +49,7 @@ end
 function ball:on_activate(staticdata, d_time)
   if staticdata ~= nil then
 
-    local id, arena = arena_lib.get_arena_by_name("block_league", staticdata)
+    local _, arena = arena_lib.get_arena_by_name("block_league", staticdata)
 
     if arena == nil or not arena.in_game then
       self:_destroy()
@@ -62,10 +60,10 @@ function ball:on_activate(staticdata, d_time)
 
     local ball_obj = self.object
 
-    self.p_name = nil
-    self.timer_bool = false
-    self.team_id = nil
-    self.timer = 0
+    self._p_name = nil
+    self._timer_bool = false
+    self._team_id = nil
+    self._timer = 0
     self.arena = arena
 
     ball_obj:set_hp(65535)
@@ -91,11 +89,11 @@ function ball:on_step(d_time, moveresult)
   end
 
   --se nessuno la sta portando a spasso...
-  if self.p_name == nil then
+  if self._p_name == nil then
     -- se il timer per il reset è attivo, controllo a che punto sta
-    if self.timer_bool then
-      self.timer = self.timer + d_time
-      if self.timer > self.initial_properties.timer_limit then
+    if self._timer_bool then
+      self._timer = self._timer + d_time
+      if self._timer > self._timer_limit then
         self:reset()
       return end
     end
@@ -114,7 +112,7 @@ function ball:on_step(d_time, moveresult)
   -- se ce l'ha qualcuno
   -- NB: se quel qualcuno è appena morto, al posto di controllarlo qui su ogni step, viene controllato sul callback della morte in player_manager.lua
   else
-    local p_name = self.p_name
+    local p_name = self._p_name
     local wielder = minetest.get_player_by_name(p_name)
 
     -- se si è disconnesso
@@ -124,7 +122,7 @@ function ball:on_step(d_time, moveresult)
     end
 
     local p_pos = wielder:get_pos()
-    local goal = arena.teams[self.team_id].name == S("orange") and arena.goal_orange or arena.goal_blue
+    local goal = arena.teams[self._team_id].name == S("orange") and arena.goal_orange or arena.goal_blue
 
     check_for_touchdown(arena, self, p_name, p_pos, goal)
   end
@@ -136,8 +134,8 @@ function ball:attach(player)
   local arena = self.arena
   local p_name = player:get_player_name()
 
-  self.p_name = p_name
-  self.team_id = arena.players[p_name].teamID
+  self._p_name = p_name
+  self._team_id = arena.players[p_name].teamID
 
   self:announce_ball_possession_change()
 
@@ -145,16 +143,16 @@ function ball:attach(player)
   block_league.stamina_drain(arena, p_name)
 
   arena.players[p_name].points = arena.players[p_name].points + 2
-  block_league.info_panel_update(arena, self.team_id)
+  block_league.info_panel_update(arena, self._team_id)
   block_league.HUD_spectate_update(arena, p_name, "ball")
 
   local ball_obj = self.object
-  local team_texture = self.team_id == 1 and "bl_ball_orange.png" or "bl_ball_blue.png"
+  local team_texture = self._team_id == 1 and "bl_ball_orange.png" or "bl_ball_blue.png"
 
   ball_obj:set_attach(player, "Body", {x=0, y=18, z=0}, {x=0, y=0, z=0})
 
-  self.timer_bool = false
-  self.timer = 0
+  self._timer_bool = false
+  self._timer = 0
 
   ball_obj:set_properties({textures={team_texture}})
   ball_obj:set_animation({x=120,y=160}, 20, 0, true)   -- smette di oscillare quando presa
@@ -169,7 +167,7 @@ end
 
 
 function ball:detach(skip_announcement)
-  local p_name = self.p_name
+  local p_name = self._p_name
   local player = minetest.get_player_by_name(p_name)
   local arena = self.arena
 
@@ -186,9 +184,9 @@ function ball:detach(skip_announcement)
 
   ball_obj:set_detach()
 
-  self.p_name = nil
-  self.timer_bool = true
-  self.timer = 0
+  self._p_name = nil
+  self._timer_bool = true
+  self._timer = 0
 
   ball_obj:set_properties({textures={"bl_ball_unclaimed.png"}})
   ball_obj:set_animation({x=0,y=40}, 20, 0, true)
@@ -204,8 +202,8 @@ function ball:reset()
   block_league.HUD_ball_update_all(arena, S("Ball reset"))
 
   -- se è agganciata a qualcunə...
-  if self.p_name then
-    local wielder = minetest.get_player_by_name(self.p_name)
+  if self._p_name then
+    local wielder = minetest.get_player_by_name(self._p_name)
 
     if wielder:get_hp() > 0 and wielder:get_meta():get_int("bl_is_speed_locked") == 0 then
       wielder:set_physics_override({speed = block_league.SPEED})
@@ -214,10 +212,10 @@ function ball:reset()
     self:detach(true)
   end
 
-  self.p_name = nil
-  self.team_id = nil
-  self.timer_bool = false
-  self.timer = 0
+  self._p_name = nil
+  self._team_id = nil
+  self._timer_bool = false
+  self._timer = 0
 
   self.object:set_pos(arena.ball_spawn)
 end
@@ -226,7 +224,7 @@ end
 
 function ball:announce_ball_possession_change(is_ball_lost)
   local arena = self.arena
-  local teamID = self.team_id
+  local teamID = self._team_id
   local enemy_teamID = teamID == 1 and 2 or 1
 
   if is_ball_lost then
@@ -241,7 +239,7 @@ function ball:announce_ball_possession_change(is_ball_lost)
     block_league.HUD_ball_update_team(arena, enemy_teamID, S("Enemy team has lost the ball!"), "0xabf877")
 
   else
-    local p_name = self.p_name
+    local p_name = self._p_name
     block_league.HUD_log_update(arena, "bl_log_ball.png", p_name, "")
 
     arena_lib.sound_play_team(arena, teamID, "bl_crowd_cheer")
@@ -369,7 +367,7 @@ minetest.register_entity("block_league:ball", ball)
 
 function block_league.get_ball(player)
   for _, child in pairs (player:get_children()) do
-    if child:get_luaentity() and child:get_luaentity().timer then
+    if child:get_luaentity() and child:get_luaentity()._timer then
       return child:get_luaentity()
     end
   end