diff --git a/CHANGELOG.md b/CHANGELOG.md
index ddfb9f9..1f16796 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Added
+
+- Add a gamesystem module
+
 ### Changed
 
 - **world:** extract map module from the world module
diff --git a/gamecore/init.lua b/gamecore/init.lua
index 1831d01..67b5204 100644
--- a/gamecore/init.lua
+++ b/gamecore/init.lua
@@ -56,6 +56,10 @@ function CoreSystem:new()
   self.lang         = Lang(self)
 end
 
+function CoreSystem:registerGameSystem(gamesystem)
+  self.game = gamesystem
+end
+
 -- MOUSE FUNCTIONS
 -- get directly the mouse when needed
 
@@ -88,6 +92,10 @@ function CoreSystem:update(dt)
   self.debug:update(dt)
   self.input:update(dt)
 
+  if (self.game ~= nil) then
+    self.game:update(dt)
+  end
+
   self.scenemanager:update(dt)
 end
 
diff --git a/gamecore/modules/gamesystem/init.lua b/gamecore/modules/gamesystem/init.lua
new file mode 100644
index 0000000..9c33db9
--- /dev/null
+++ b/gamecore/modules/gamesystem/init.lua
@@ -0,0 +1,145 @@
+-- game :: The main game subsystem. Basically a big object that handle all the
+-- game-related data like characters, monsters, etc. While the core aim to be
+-- reusable at will, the game is specifically made for the current game.
+
+-- It's also what handle the savedata for games
+
+--[[
+  Copyright © 2019 Kazhnuz
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of
+  this software and associated documentation files (the "Software"), to deal in
+  the Software without restriction, including without limitation the rights to
+  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+  the Software, and to permit persons to whom the Software is furnished to do so,
+  subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+]]
+
+local cwd  = (...):gsub('%.init$', '') .. "."
+local cwd2 = (...):gsub('%.gamesystem.init$', '') .. "."
+
+local GameSystem  = Object:extend()
+local binser      = require(cwd2 .. "libs.binser")
+
+local DEFAULT_SAVENUMBER = 3
+
+function GameSystem:new()
+  self.currentSlot = -1
+
+  self.submodules = {}
+  self.playtime = 0
+  self:register()
+end
+
+function GameSystem:register()
+  core:registerGameSystem(self)
+end
+
+function GameSystem:registerSubmodules(submodule)
+  local name = submodule.name
+  self.submodules[name] = submodule
+end
+
+-- UPDATE FUNCTIONS
+-- Update every submodules
+
+function GameSystem:update(dt)
+  self.playtime = self.playtime + dt
+  for k, submodule in pairs(self.submodules) do
+    submodule:update(dt)
+  end
+end
+
+-- DATA MANAGEMENT FUNCTIONS
+-- Get and set data in the gamesystem object
+
+function GameSystem:setData(data)
+  local data = data
+  self.playtime   = data.playtime
+  for k, submodule in pairs(self.submodules) do
+    submodule:setData(data[k])
+  end
+end
+
+function GameSystem:getData()
+  local data = {}
+  data.playtime   = self.playtime
+  for k, submodule in pairs(self.submodules) do
+    data[k] = submodule:getData()
+  end
+  return data
+end
+
+-- SAVE MANAGEMENT FUNCTIONS
+-- Get and set data in the gamesystem object
+
+function GameSystem:getSaveNumber()
+  return DEFAULT_SAVENUMBER
+end
+
+function GameSystem:resetSave(saveid)
+  if love.filesystem.exists("save" .. saveid .. ".save") then
+    love.filesystem.remove( "save" .. saveid .. ".save" )
+  end
+end
+
+function GameSystem:resetAllSaves()
+  for i=1, self:getSaveNumber() do
+    self:resetSave(i)
+  end
+end
+
+function GameSystem:getSavePath(saveid, absolute)
+  local saveDir = ""
+  if (absolute) then
+    saveDir = love.filesystem.getSaveDirectory() .. "/"
+    if not love.filesystem.exists(saveDir) then
+      love.filesystem.createDirectory( "" )
+    end
+  end
+
+  local filepath = saveDir .. self:getSaveName(saveid)
+
+  return filepath
+end
+
+function GameSystem:getSaveName(saveid)
+  return "save" .. saveid .. ".save"
+end
+
+function GameSystem:saveFileExist(saveid)
+  return love.filesystem.exists(self:getSaveName(saveid))
+end
+
+function GameSystem:read(saveid)
+  self.currentSlot = saveid or self.currentSlot
+  if (self.currentSlot > 0) then
+    local savepath = self:getSavePath(self.currentSlot, true)
+    if self:saveFileExist(self.currentSlot) then
+      local datas = binser.readFile(savepath)
+
+      self:setData(datas[1])
+    end
+  end
+end
+
+function GameSystem:write()
+  if (self.currentSlot > 0) then
+    local data = self:getData()
+
+    savepath = self:getSavePath(self.currentSlot, true)
+    binser.writeFile(savepath, data)
+  end
+end
+
+return GameSystem
diff --git a/gamecore/libs/binser.lua b/gamecore/modules/gamesystem/libs/binser.lua
similarity index 100%
rename from gamecore/libs/binser.lua
rename to gamecore/modules/gamesystem/libs/binser.lua
diff --git a/gamecore/modules/gamesystem/submodule.lua b/gamecore/modules/gamesystem/submodule.lua
new file mode 100644
index 0000000..5ea5486
--- /dev/null
+++ b/gamecore/modules/gamesystem/submodule.lua
@@ -0,0 +1,23 @@
+local SubModule = Object:extend()
+
+function SubModule:new(game, name)
+  self.name = name or error("SUBMODULE must have a name")
+  self.game = game
+  self.data = {}
+
+  self:register()
+end
+
+function SubModule:register()
+  self.game:registerSubmodules(self)
+end
+
+function SubModule:getData()
+  return self.data
+end
+
+function SubModule:setData(data)
+  self.data = data
+end
+
+return SubModule
diff --git a/gamecore/options.lua b/gamecore/options.lua
index 7c1c791..d1e3424 100644
--- a/gamecore/options.lua
+++ b/gamecore/options.lua
@@ -25,7 +25,7 @@
 local OptionsManager = Object:extend()
 
 local cwd  = (...):gsub('%.options$', '') .. "."
-local binser = require(cwd .. "libs.binser")
+local binser = require(cwd .. "modules.gamesystem.libs.binser")
 
 local TRANSLATION_PATH = "datas/languages/"