/// <summary>
        /// Carrega conteúdo inicial, comum a todas as cenas de jogo, e registra serviços
        /// úteis capaz de serem utilizados pelos GameObjects
        /// </summary>
        /// <param name="content"></param>
        /// <param name="services"></param>
        public static void LoadContent()
        {
            if (state != GameStates.Unloaded)
            {
                return;
            }

            spriteBatch = new SpriteBatch(GraphicsDevice);

            MainCamera = new DefaultGameCamera(game.GraphicsDevice);
            MainCamera.Initialize();

            Input = new GameInputManager(game, NoActionGameController.Instance);
            Input.Initialize();

            Sound = new SoundManager();

            scenes = new GameScene[]
            {
                new TitleScreenScene(),
                new MapBasedGameScene(5, "maps/lab_map_005", Color.Black),
                new MapBasedGameScene(4, "maps/lab_map_004", Color.Black),
                new CreditsScene()
            };

            PAUSE_PANEL = new SemiTransparentDarkPanel();
            PAUSE_PANEL.LoadContent();

            currentSceneIndex = DEFAULT_FIRST_SCENE;
            state             = GameStates.Ready;
        }