diff --git a/src/Core/SnakeProject/defaultcontrol.h b/src/Core/SnakeProject/defaultcontrol.h
index 5fc19b2..1e8466f 100644
--- a/src/Core/SnakeProject/defaultcontrol.h
+++ b/src/Core/SnakeProject/defaultcontrol.h
@@ -2,11 +2,12 @@
 #define DEFAULTCONTROL_H
 
 #include "icontrol.h"
+#include "global.h"
 
 /**
  * @brief The DefaultControl class This class contains default implementation of the game menu.
  */
-class DefaultControl : public IControl {
+class SNAKEPROJECT_EXPORT DefaultControl : public IControl {
     Q_OBJECT
 public:
     DefaultControl();
diff --git a/src/Core/SnakeProject/guiobject.h b/src/Core/SnakeProject/guiobject.h
index 9f80259..3c67bf2 100644
--- a/src/Core/SnakeProject/guiobject.h
+++ b/src/Core/SnakeProject/guiobject.h
@@ -11,8 +11,7 @@
 /**
  * @brief The GuiObject class This base model for gui objects.
  */
-class GuiObject: public QObject, public IRender
-{
+class SNAKEPROJECT_EXPORT GuiObject: public QObject, public IRender {
     Q_OBJECT
     Q_PROPERTY(QString color READ color WRITE setColor NOTIFY colorChanged)
     Q_PROPERTY(int guiId READ guiId NOTIFY guiIdChanged)
diff --git a/src/Core/SnakeProject/iai.h b/src/Core/SnakeProject/iai.h
index e827b5c..1fe6fd3 100644
--- a/src/Core/SnakeProject/iai.h
+++ b/src/Core/SnakeProject/iai.h
@@ -1,6 +1,8 @@
 #ifndef IAI_H
 #define IAI_H
 
+#include "global.h"
+
 /**
  * @brief The IAI class Is default interface for ai classes.
  * @note example of use :
@@ -11,7 +13,7 @@
  * }
  * ```
  */
-class IAI {
+class SNAKEPROJECT_EXPORT IAI {
 public:
     IAI();
     virtual ~IAI() = default;
diff --git a/src/Core/SnakeProject/icontrol.h b/src/Core/SnakeProject/icontrol.h
index 446e41c..7f7cbd9 100644
--- a/src/Core/SnakeProject/icontrol.h
+++ b/src/Core/SnakeProject/icontrol.h
@@ -1,6 +1,8 @@
 #ifndef ICONTROL_H
 #define ICONTROL_H
+
 #include <QObject>
+#include "global.h"
 
 /**
  * @brief The IControl class This interface should be contains implementation of custom user interface
@@ -11,7 +13,7 @@
  *  For more information see the DefaultControl class.
  *
  */
-class IControl : public QObject {
+class SNAKEPROJECT_EXPORT IControl : public QObject {
     Q_OBJECT
     Q_PROPERTY(QString view READ view NOTIFY viewChanged)
 
diff --git a/src/Core/SnakeProject/iground.h b/src/Core/SnakeProject/iground.h
index 9358158..757cfc7 100644
--- a/src/Core/SnakeProject/iground.h
+++ b/src/Core/SnakeProject/iground.h
@@ -2,12 +2,12 @@
 #define IGROUND_H
 
 #include "iworlditem.h"
+#include "global.h"
 
 /**
  * @brief The IGround class This is one tile of the world. Any objects of this type created automatically for filing ground plain.
  */
-class IGround: public IWorldItem
-{
+class SNAKEPROJECT_EXPORT IGround: public IWorldItem {
 public:
     IGround();
 
diff --git a/src/Core/SnakeProject/iplayer.h b/src/Core/SnakeProject/iplayer.h
index 698cea5..4efb124 100644
--- a/src/Core/SnakeProject/iplayer.h
+++ b/src/Core/SnakeProject/iplayer.h
@@ -3,14 +3,14 @@
 
 #include "gameresult.h"
 #include "iworlditem.h"
+#include "global.h"
 
 class IControl;
 
 /**
  * @brief The IPlayer class This is base class of the player functions.
  */
-class IPlayer: public IWorldItem
-{
+class SNAKEPROJECT_EXPORT IPlayer: public IWorldItem {
     Q_OBJECT
 public:
     IPlayer();
diff --git a/src/Core/SnakeProject/irender.h b/src/Core/SnakeProject/irender.h
index f6ebd56..90da072 100644
--- a/src/Core/SnakeProject/irender.h
+++ b/src/Core/SnakeProject/irender.h
@@ -1,13 +1,13 @@
 #ifndef IRENDER_H
 #define IRENDER_H
 
+#include "global.h"
 
 /**
  * @brief The IRender class This interface provide render functionality for all objects.
  * @note Override the render method.
  */
-class IRender
-{
+class SNAKEPROJECT_EXPORT IRender {
 public:
     IRender();
 
diff --git a/src/Core/SnakeProject/iworld.h b/src/Core/SnakeProject/iworld.h
index fe82e5b..245ad7d 100644
--- a/src/Core/SnakeProject/iworld.h
+++ b/src/Core/SnakeProject/iworld.h
@@ -11,6 +11,7 @@
 #include <QString>
 #include "irender.h"
 #include "diff.h"
+#include "global.h"
 
 class IWorldItem;
 class IPlayer;
@@ -39,7 +40,7 @@ struct WorldObjectWraper {
 /**
  * @brief The IWorld class use this interface for implementation your own game levels
  */
-class IWorld : public QObject, public IRender
+class SNAKEPROJECT_EXPORT IWorld : public QObject, public IRender
 {
     Q_OBJECT
     Q_PROPERTY(QVector3D cameraReleativePosition READ cameraReleativePosition NOTIFY cameraReleativePositionChanged)
diff --git a/src/Core/SnakeProject/iworlditem.h b/src/Core/SnakeProject/iworlditem.h
index c99676f..b523816 100644
--- a/src/Core/SnakeProject/iworlditem.h
+++ b/src/Core/SnakeProject/iworlditem.h
@@ -2,12 +2,13 @@
 #define IWORLDITEM_H
 
 #include <SnakeProject/guiobject.h>
+#include "global.h"
 
 class IWorld;
 /**
  * @brief The IWorldItem class This is World item. This class contains functions for control event system.
  */
-class IWorldItem: public GuiObject {
+class SNAKEPROJECT_EXPORT IWorldItem: public GuiObject {
     Q_OBJECT
 public:
     IWorldItem();
diff --git a/src/Core/private/pluginloader.cpp b/src/Core/private/pluginloader.cpp
index 24526fc..72e5703 100644
--- a/src/Core/private/pluginloader.cpp
+++ b/src/Core/private/pluginloader.cpp
@@ -17,7 +17,7 @@ IWorld* PluginLoader::load(const QString &pluginPath) {
         QuasarAppUtils::Params::log("Fail to load game module. Message: " + lib.errorString(),
                                     QuasarAppUtils::Error);
 
-        return {};
+        return nullptr;
     }
 
     worldInstance worldFunc = (worldInstance)lib.resolve("worldInstance");
@@ -28,7 +28,7 @@ IWorld* PluginLoader::load(const QString &pluginPath) {
                                     QuasarAppUtils::Error);
 
         lib.unload();
-        return {};
+        return nullptr;
     }
 
     return worldFunc();