diff --git a/gamecore/input.lua b/gamecore/input.lua
index 539e8f8..c0c0078 100644
--- a/gamecore/input.lua
+++ b/gamecore/input.lua
@@ -51,7 +51,9 @@ function InputManager:isDown(sourceid, padkey)
     local key = self.data[sourceid].keys[padkey]
     isdown = love.keyboard.isDown(key)
   else
-    print("Warning: unsupported input device")
+    local type = self.data[sourceid].type or "nil"
+    local warnstring = "unsupported input device " .. type .. " for source " .. sourceid
+    core.debug:warning("core/input", warnstring)
   end
 
   return isdown
diff --git a/gamecore/lang.lua b/gamecore/lang.lua
index 3691707..260c82d 100644
--- a/gamecore/lang.lua
+++ b/gamecore/lang.lua
@@ -95,7 +95,7 @@ function LanguageManager:getTranslationStringList(lang, library)
   if fileinfo ~= nil then
     list = require(_path)
   else
-    print("WARNING: file " .. _path .. " do not exists")
+    core.debug:warning("core/lang","file " .. _path .. " do not exists")
   end
 
   return list
@@ -120,7 +120,7 @@ function LanguageManager:translate(library, string)
 
   if (translation == nil) then
     translation = string
-    print("WARNING: no translation path found for " .. string .. " in " .. library)
+    core.debug:warning("core/lang", "no translation path found for " .. string .. " in " .. library)
   end
 
   return translation
diff --git a/gamecore/modules/assets/animator.lua b/gamecore/modules/assets/animator.lua
index 17fa139..d788949 100644
--- a/gamecore/modules/assets/animator.lua
+++ b/gamecore/modules/assets/animator.lua
@@ -48,7 +48,7 @@ end
 
 function Animator:update(dt)
   if (self.currentAnimation == "") then
-    print("warning: no current animation data")
+    core.debug:warning("animator", "no current animation data")
     return 0
   end
 
diff --git a/gamecore/modules/assets/init.lua b/gamecore/modules/assets/init.lua
index 1634110..8dd7fb4 100644
--- a/gamecore/modules/assets/init.lua
+++ b/gamecore/modules/assets/init.lua
@@ -90,7 +90,7 @@ function Assets:batchImport(datafile)
     elseif (asset_type == "sfx") then
       self:importSFX(assets)
     else
-      print("Unkown asset type : " .. asset_type)
+      core.debug:warning("assets/importer", "unkown asset type " .. asset_type)
     end
   end
 end
diff --git a/gamecore/modules/scenes.lua b/gamecore/modules/scenes.lua
index 9da7c83..a28f18f 100644
--- a/gamecore/modules/scenes.lua
+++ b/gamecore/modules/scenes.lua
@@ -150,7 +150,7 @@ end
 
 function Scene:getKeys(sourceid)
   if sourceid == nil then
-    print("WARNING", "no sourceid detected, will default to 1")
+    core.debug:warning("scene", "no sourceid detected, will default to 1")
   end
 
   local sourceid = sourceid or 1
diff --git a/gamecore/modules/world/actors/actor2D.lua b/gamecore/modules/world/actors/actor2D.lua
index 0c2c5c6..1b8c794 100644
--- a/gamecore/modules/world/actors/actor2D.lua
+++ b/gamecore/modules/world/actors/actor2D.lua
@@ -163,7 +163,7 @@ end
 
 function Actor2D:addHitbox(name, type, ox, oy, w, h, isSolid)
   if (self.hitboxes[name] ~= nil) then
-    print("ERROR:", "The hitbox " .. name .. " already exists")
+    core.debug:warning("actor2D", "the hitbox " .. name .. " already exists")
   else
     local hitbox = Hitbox(self, type, ox, oy, w, h, isSolid)
     self.hitboxes[name] = hitbox
diff --git a/gamecore/modules/world/actors/actor3D.lua b/gamecore/modules/world/actors/actor3D.lua
index a87142c..c5f4208 100644
--- a/gamecore/modules/world/actors/actor3D.lua
+++ b/gamecore/modules/world/actors/actor3D.lua
@@ -187,7 +187,7 @@ end
 
 function Actor3D:addHitbox(name, type, ox, oy, oz, w, h, d, isSolid)
   if (self.hitboxes[name] ~= nil) then
-    print("ERROR:", "The hitbox " .. name .. " already exists")
+    core.debug:warning("actor3D", "the hitbox " .. name .. " already exists")
   else
     local hitbox = Hitbox(self, type, ox, oy, oz, w, h, d, isSolid)
     self.hitboxes[name] = hitbox
diff --git a/gamecore/modules/world/actors/utils/boxes/mapped.lua b/gamecore/modules/world/actors/utils/boxes/mapped.lua
index ce7cb67..e733cab 100644
--- a/gamecore/modules/world/actors/utils/boxes/mapped.lua
+++ b/gamecore/modules/world/actors/utils/boxes/mapped.lua
@@ -36,8 +36,8 @@ function MappedBox:new(owner, x, y, z, w, h, d)
 end
 
 function MappedBox:drawTextureContent()
-  print(self.x, self.y, self.z)
   local tx, ty = self.x, self.y - (self.z + self.d)
+  core.debug:print("mappedbox", "getting map layers at position " .. tx .. ";" .. ty)
   love.graphics.push()
   love.graphics.origin()
   love.graphics.translate(math.floor(-tx), math.floor(-ty))
diff --git a/gamecore/modules/world/baseworld.lua b/gamecore/modules/world/baseworld.lua
index 9ac5ac7..c0c29a9 100644
--- a/gamecore/modules/world/baseworld.lua
+++ b/gamecore/modules/world/baseworld.lua
@@ -103,11 +103,16 @@ function BaseWorld:initActors( )
 end
 
 function BaseWorld:newActor(name, x, y, z)
+  local debugstring  = " at (" .. x .. ";" .. y .. ")."
+  core.debug:print("world2D", "adding actor " .. name .. debugstring)
   self.obj.index[name](self, x, y)
 end
 
 function BaseWorld:newCollision(name, x, y, z, w, h, d)
-  print("Creating collision " .. name .. " at position " .. x .. ";" .. y .. ". Size is " .. w .. ";" .. h)
+  local debugstringpos  = "at (" .. x .. ";" .. y .. ")"
+  local debugstringsize = "size is (" .. w .. ";" .. h .. ")"
+  local debugstring     = " " .. debugstringpos .. ". " .. debugstringsize .. "."
+  core.debug:print("world2D", "creating collision " .. name .. debugstring)
   self.obj.collisions[name](self, x, y, w, h)
 end
 
diff --git a/gamecore/modules/world/camera/init.lua b/gamecore/modules/world/camera/init.lua
index edf6823..e3d292f 100644
--- a/gamecore/modules/world/camera/init.lua
+++ b/gamecore/modules/world/camera/init.lua
@@ -47,7 +47,7 @@ end
 
 function CameraSystem:setMode(mode)
   self.mode = mode
-  print("Camera system mode set to " .. mode)
+  core.debug:print("camera", "mode is now set to " .. mode)
   return mode
 end
 
diff --git a/gamecore/modules/world/maps/sti.lua b/gamecore/modules/world/maps/sti.lua
index 795df2d..ca10745 100644
--- a/gamecore/modules/world/maps/sti.lua
+++ b/gamecore/modules/world/maps/sti.lua
@@ -33,7 +33,8 @@ end
 function StiMap:loadCollisions()
   for k, objectlayer in pairs(self.sti.layers) do
     if self.world:isCollisionIndexed(objectlayer.name) then
-      print("DEBUG: loading actors in " .. objectlayer.name .. " collision layer")
+      local debugstring = "loading " .. #objectlayer.objects .. " objects in " .. objectlayer.name .. " collision layer"
+      core.debug:print("map/sti", debugstring)
         for k, object in pairs(objectlayer.objects) do
           self:newCollision(objectlayer, object)
         end
@@ -45,7 +46,8 @@ end
 function StiMap:loadActors()
   for k, objectlayer in pairs(self.sti.layers) do
     if self.world:isActorIndexed(objectlayer.name) then
-      print("DEBUG: loading actors in " .. objectlayer.name .. " actor layer")
+      local debugstring = "loading " .. #objectlayer.objects .. " objects in " .. objectlayer.name .. " actor layer"
+      core.debug:print("map/sti", debugstring)
         for k, object in pairs(objectlayer.objects) do
           if (object.properties.batchActor) then
             self:batchActor(objectlayer, object)
@@ -61,7 +63,8 @@ end
 function StiMap:loadPlayers()
   for k, objectlayer in pairs(self.sti.layers) do
     if (objectlayer.name == "player") then
-      print("DEBUG: loading actors in player layer")
+      local debugstring = "loading at most " .. #objectlayer.objects .. " actors in " .. objectlayer.name .. " actor layer"
+      core.debug:print("map/sti", debugstring)
       local i = 1
         for k, object in pairs(objectlayer.objects) do
           self:newPlayer(object, i)
@@ -87,7 +90,6 @@ function StiMap:batchActor(objectlayer, object)
 
   for i=1, cellHor do
     for j=1, cellVert do
-      print("DEBUG:", "Setting the world to create actor " .. name)
       self.world:newActor(name, x + (i-1)*gwidth, y + (j-1)*gheight, z)
     end
   end
@@ -102,7 +104,6 @@ function StiMap:newActor(objectlayer, object)
     y = y + z
   end
 
-  print("DEBUG:", "Setting the world to create actor " .. objectlayer.name)
   self.world:newActor(objectlayer.name, object.x, y, z)
 end
 
@@ -113,12 +114,12 @@ function StiMap:newCollision(objectlayer, object)
 
   local y = object.y
   if (fromTop) then
-    print("create from top, set z and y:", z, y, "=>", z-d, y+z)
+    local poschange = z .. ";" .. y .. " => " .. z-d .. ";" .. y+z
+    core.debug:print("map/sti", "create from top, set z and y: " .. poschange)
     y = y + z
     z = z - d
   end
 
-  print("DEBUG:", "Setting the world to create collision " .. objectlayer.name)
   self.world:newCollision(objectlayer.name, object.x, y, z, object.width, object.height, d)
 end
 
@@ -128,10 +129,10 @@ function StiMap:newPlayer(object, i)
 
   local y = object.y
   if (adaptPosition) then
+    core.debug:print("map/sti", "adapting position, set y: " .. y .. " => ", y+z)
     y = y + z
   end
 
-  print("DEBUG:", "Setting the world to create player " .. i)
   self.world:addPlayer(object.x, y, z, i)
 end
 
diff --git a/gamecore/options.lua b/gamecore/options.lua
index d1e3424..28b8efb 100644
--- a/gamecore/options.lua
+++ b/gamecore/options.lua
@@ -33,10 +33,10 @@ local TRANSLATION_PATH = "datas/languages/"
 -- Initialize and configure the game options
 
 function OptionsManager:new(controller)
+  self.controller = controller
   -- We begin by creating an empty data table before reading the data.
   self.data = {}
   self:read()
-  self.controller = controller
 end
 
 function OptionsManager:reset()
@@ -152,11 +152,11 @@ function OptionsManager:read()
   filepath = self:getFile(true)
   if utils.filesystem.exists("options.data") then
     local loadedDatas = binser.readFile(filepath)
-    print("data file found, loading it")
+    self.controller.debug:print("core/options", "data file found, loading it")
     self:setData(loadedDatas[1])
   else
     self:reset()
-    print("no data file found, reseting data")
+    self.controller.debug:print("core/options", "no data file found, reseting data")
   end
 end