diff --git a/birb/core/input.lua b/birb/core/input.lua
index b8d0c70..5304b1f 100644
--- a/birb/core/input.lua
+++ b/birb/core/input.lua
@@ -69,6 +69,7 @@ end
 
 function InputManager:getKey(sourceid, padkey)
   local padkey = padkey
+  local key
   for k,v in pairs(self.data[sourceid].keys) do
     if (k == padkey) then key = v end
   end
diff --git a/birb/core/options.lua b/birb/core/options.lua
index 46b0ce9..96b4d9c 100644
--- a/birb/core/options.lua
+++ b/birb/core/options.lua
@@ -121,6 +121,7 @@ function OptionsManager:getTranslationDefaultData()
   local _path = TRANSLATION_PATH .. "init.lua"
   local fileinfo = love.filesystem.getInfo(_path)
   local datas = nil
+  local lang = nil
 
   if fileinfo ~= nil then
     lang = require(TRANSLATION_PATH)
@@ -146,12 +147,12 @@ end
 function OptionsManager:write()
   local data = self:getData()
 
-  filepath = self:getFile(true)
+  local filepath = self:getFile(true)
   binser.writeFile(filepath, data)
 end
 
 function OptionsManager:read()
-  filepath = self:getFile(true)
+  local filepath = self:getFile(true)
   if utils.filesystem.exists("options.data") then
     local loadedDatas = binser.readFile(filepath)
     self.core.debug:logInfo("core/options", "data file found, loading it")
diff --git a/birb/modules/assets/background.lua b/birb/modules/assets/background.lua
index 7a0ac56..4c4ecca 100644
--- a/birb/modules/assets/background.lua
+++ b/birb/modules/assets/background.lua
@@ -32,7 +32,7 @@ function Background:new(filepath)
   self.batch    = love.graphics.newSpriteBatch(self.image , 1000 )
 
   self.width, self.height   = self.image:getDimensions()
-  screenwidth, screenheight = core.screen:getDimensions()
+  local screenwidth, screenheight = core.screen:getDimensions()
 
   local w = math.floor(screenwidth / self.width)    * self.width   + 1
   local h = math.floor(screenheight / self.height)  * self.height  + 1
diff --git a/birb/modules/gamesystem/init.lua b/birb/modules/gamesystem/init.lua
index 82b0649..5841f16 100644
--- a/birb/modules/gamesystem/init.lua
+++ b/birb/modules/gamesystem/init.lua
@@ -136,7 +136,7 @@ function GameSystem:write()
   if (self.currentSlot > 0) then
     local data = self:getData()
 
-    savepath = self:getSavePath(self.currentSlot, true)
+    local savepath = self:getSavePath(self.currentSlot, true)
     binser.writeFile(savepath, data)
   end
 end
diff --git a/birb/modules/menusystem/grid.lua b/birb/modules/menusystem/grid.lua
index e1fd8ed..3c3db9b 100644
--- a/birb/modules/menusystem/grid.lua
+++ b/birb/modules/menusystem/grid.lua
@@ -146,7 +146,7 @@ end
 -- Handle the keyboard/manette functions
 
 function GridBox:keyreleased(key, code)
-  slotID = self:getWidgetSlot(self.widget.selected)
+  local slotID = self:getWidgetSlot(self.widget.selected)
   local col, line = self.cursor.x, self.cursor.y
   if key == 'left' then
     self:moveCol(-1)
@@ -172,7 +172,7 @@ end
 function GridBox:moveCol(direction)
   local orig_x, orig_y = self:getSlotCenter(self.widget.selected)
   local distance = self.w -- on met directement à la distance max possible le système
-  local nearastWidget = 0
+  local nearestWidget = 0
   for i,v in ipairs(self.slots) do
     local xx, yy = self:getSlotCenter(i)
     -- On commence par vérifier si le slot est bien positionné par rapport au
@@ -193,7 +193,7 @@ end
 function GridBox:moveLine(direction)
   local orig_x, orig_y = self:getSlotCenter(self.widget.selected)
   local distance = self.h -- on met directement à la distance max possible le système
-  local nearastWidget = 0
+  local nearestWidget = 0
   for i,v in ipairs(self.slots) do
     local xx, yy = self:getSlotCenter(i)
     -- On commence par vérifier si le slot est bien positionné par rapport au
diff --git a/birb/modules/world/actors/baseactor.lua b/birb/modules/world/actors/baseactor.lua
index a119c5d..aa4e714 100644
--- a/birb/modules/world/actors/baseactor.lua
+++ b/birb/modules/world/actors/baseactor.lua
@@ -119,7 +119,7 @@ function BaseActor:setFilter()
 end
 
 function BaseActor:getFuturePosition(dt)
-  local dx, dy
+  local dx, dy, dz
   dx = self.x + self.xsp * dt
   dy = self.y + self.ysp * dt
   dz = self.z + self.zsp * dt
diff --git a/birb/modules/world/camera/init.lua b/birb/modules/world/camera/init.lua
index b5e4943..7d23816 100644
--- a/birb/modules/world/camera/init.lua
+++ b/birb/modules/world/camera/init.lua
@@ -179,16 +179,14 @@ function CameraSystem:attachView(id)
   	love.graphics.setCanvas(view.canvas)
   	love.graphics.clear()
 
-    if id ~= nil then
     -- Du à la manière dont fonctionne STI, on est obligé de récupérer les info
     -- de position de camera pour afficher la carte par rapport à ces infos
-      tx, ty  = self:getViewCoordinate(id)
-      scale   = self:getViewScale(id) or 1
-    	tx = math.floor(tx) * -1
-    	ty = math.floor(ty) * -1
+    local tx, ty  = self:getViewCoordinate(id)
+    local scale   = self:getViewScale(id) or 1
+    tx = math.floor(tx) * -1
+    ty = math.floor(ty) * -1
 
-      local w, h = core.screen:getDimensions()
-    end
+    local w, h = core.screen:getDimensions()
 
     love.graphics.push()
   	love.graphics.origin()
diff --git a/birb/modules/world/world3D.lua b/birb/modules/world/world3D.lua
index 70a0696..e104123 100644
--- a/birb/modules/world/world3D.lua
+++ b/birb/modules/world/world3D.lua
@@ -202,17 +202,17 @@ function World3D:zSortItems(items)
     end
 
     local _, aY, aZ, _, aH, aD = self.bodies:getCube(itemA.mainHitbox)
-    aDepth  = itemA.depth
-    aID     = itemA.creationID
-    aType   = itemA.type
+    local aDepth  = itemA.depth
+    local aID     = itemA.creationID
+    local aType   = itemA.type
     aZ     = math.ceil(aZ)
     aY     = math.ceil(aY)
 
     for _, itemB in ipairs(overlapping) do
       local _, bY, bZ, _, bH, bD = self.bodies:getCube(itemB.mainHitbox)
-      bDepth = itemB.depth
-      bID    = itemB.creationID
-      bType  = itemB.type
+      local bDepth = itemB.depth
+      local bID    = itemB.creationID
+      local bType  = itemB.type
       bZ     = math.ceil(bZ)
       bY     = math.ceil(bY)
 
@@ -246,7 +246,7 @@ function World3D:zSortItems(items)
           elseif aID < bID then
             graph:add(itemB, itemA)
           else
-            err("two object can't have the same ID")
+            error("two object can't have the same ID")
           end
         end
       end
diff --git a/birb/utils/graphics.lua b/birb/utils/graphics.lua
index 4aaac79..3587a38 100644
--- a/birb/utils/graphics.lua
+++ b/birb/utils/graphics.lua
@@ -69,7 +69,7 @@ function Graphics.printWithSpacing(text, spacing, align, x, y, r, sx, sy, ox, oy
 
   for i=1, lenght do
     local char =  string.sub(text, i, i)
-    pos = math.floor(x + xx - width)
+    local pos = math.floor(x + xx - width)
     love.graphics.print(char, pos, y)
     xx = xx + font:getWidth(char) + spacing
   end
@@ -91,16 +91,16 @@ function Graphics.drawBorder(drawable, border, x, y, r, sx, sy, ox, oy, kx, ky)
   local color = love.graphics.getColor()
   local b = border or 1
   love.graphics.setColor(0, 0, 0, 0)
-  love.graphics.draw(drawable, x-b, y-b, limit, align, r, sx, sy, ox, oy, kx, ky)
-  love.graphics.draw(drawable, x  , y-b, limit, align, r, sx, sy, ox, oy, kx, ky)
-  love.graphics.draw(drawable, x+b, y-b, limit, align, r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(drawable, x-b, y-b, r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(drawable, x  , y-b, r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(drawable, x+b, y-b, r, sx, sy, ox, oy, kx, ky)
 
-  love.graphics.draw(drawable, x+b, y  , limit, align, r, sx, sy, ox, oy, kx, ky)
-  love.graphics.draw(drawable, x-b, y  , limit, align, r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(drawable, x+b, y  , r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(drawable, x-b, y  , r, sx, sy, ox, oy, kx, ky)
 
-  love.graphics.draw(drawable, x-b, y+b, limit, align, r, sx, sy, ox, oy, kx, ky)
-  love.graphics.draw(drawable, x  , y+b, limit, align, r, sx, sy, ox, oy, kx, ky)
-  love.graphics.draw(drawable, x+b, y+b, limit, align, r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(drawable, x-b, y+b, r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(drawable, x  , y+b, r, sx, sy, ox, oy, kx, ky)
+  love.graphics.draw(drawable, x+b, y+b, r, sx, sy, ox, oy, kx, ky)
   love.graphics.setColor(color)
 
   love.graphics.draw(drawable, x, y, r, sx, sy, ox, oy, kx, ky)
@@ -114,9 +114,9 @@ function Graphics.box(x, y, w, h)
   local y = math.floor(y)
   local w = math.floor(w)
   local h = math.floor(h)
-  local a = a or 1
 
   local r, g, b, a = love.graphics.getColor( )
+  a = a or 1
 
   love.graphics.setColor(r, g, b, 0.3 * a)
   love.graphics.rectangle("fill", x, y, w, h)
diff --git a/birb/utils/math.lua b/birb/utils/math.lua
index fea382b..5f982b4 100644
--- a/birb/utils/math.lua
+++ b/birb/utils/math.lua
@@ -63,7 +63,7 @@ function Math.vector(x1, y1, x2, y2)
   local vecx, vecy
 
   vecx = x2 - x1
-  vexy = y2 - y1
+  vecy = y2 - y1
 
   return vecx, vecy
 end
@@ -107,7 +107,7 @@ function Math.numberToString(x, length)
   local string = ""
   local x = x
   if (x >= math.pow(10, length)) then
-    x = unitsNumber*10 - 1
+    x = length*10 - 1
     string = string .. x
   else
     for i=1, (length-1) do