diff --git a/README.md b/README.md
index e25d470..11c35fe 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ An organized (divided by classes separated per files) cross-platform (Windows, L
 - <kbd>R</kbd> - reset box position.
 - <kbd>WASD</kbd> or <kbd>Arrows</kbd> - move camera.
 - <kbd>Q</kbd>/<kbd>E</kbd> - adjust zoom.
-- <kbd>F</kbd> - go/exit fullscreen.
+- <kbd>F</kbd> - go/exit fullscreen (may not work properly on Linux).
 
 ### For PS Vita
 - <kbd>Cross</kbd> - reset box position.
diff --git a/src/BoxEntity.cpp b/src/BoxEntity.cpp
index f106043..57c4cf8 100644
--- a/src/BoxEntity.cpp
+++ b/src/BoxEntity.cpp
@@ -1,15 +1,14 @@
 #include "BoxEntity.h"
 
-BoxEntity::BoxEntity(b2World* world, SDL_Renderer* renderer, const char* path_to_texture, float x_box, float y_box, float w_box, float h_box, float angle_box)
+BoxEntity::BoxEntity(const char* path_to_texture, float x_box, float y_box, float w_box, float h_box, float angle_box)
 {
-    BoxEntity::world = world;
     BoxEntity::x = x_box + (w_box / 2);
     BoxEntity::y = y_box + (h_box / 2);
     BoxEntity::w = w_box;
     BoxEntity::h = h_box;
     BoxEntity::angle = angle_box;
 
-    BoxEntity::LoadTexture(renderer, path_to_texture);
+    BoxEntity::pathToTexture = path_to_texture;
     
     BoxEntity::bodyDef.type = b2_dynamicBody;
     BoxEntity::bodyDef.angle = BoxEntity::angle; 
@@ -17,16 +16,21 @@ BoxEntity::BoxEntity(b2World* world, SDL_Renderer* renderer, const char* path_to
 
     BoxEntity::vel.Set(0, 0.2f);
 
-    BoxEntity::body = BoxEntity::world->CreateBody(&bodyDef);
-    BoxEntity::body->SetLinearVelocity(BoxEntity::vel);
-    
     BoxEntity::boxShape.SetAsBox(BoxEntity::w / 2.0f, BoxEntity::h / 2.0f);
     
     BoxEntity::fixtureDef.shape = &(BoxEntity::boxShape);
     BoxEntity::fixtureDef.density = 1;
     BoxEntity::fixtureDef.friction = 0.3f;
     BoxEntity::fixtureDef.restitution = 0.5f;
+}
+
+void BoxEntity::Register(b2World* world, SDL_Renderer* renderer)
+{
+    BoxEntity::body = world->CreateBody(&(BoxEntity::bodyDef));
+    BoxEntity::body->SetLinearVelocity(BoxEntity::vel);
     BoxEntity::body->CreateFixture(&(BoxEntity::fixtureDef));
+    
+    BoxEntity::LoadTexture(renderer);
 }
 
 void BoxEntity::Reset()
diff --git a/src/BoxEntity.h b/src/BoxEntity.h
index 2fb4d39..17eb925 100644
--- a/src/BoxEntity.h
+++ b/src/BoxEntity.h
@@ -16,16 +16,20 @@ class BoxEntity: public PhysicsObj
 
 public:
     /// @brief Create a new box entity.
-    /// @param world the world where box exists.
-    /// @param renderer the rendering context.
     /// @param path_to_texture path to the image file of texture.
     /// @param x_box position X of upper left corner of the box in Box2D meters.
     /// @param y_box position Y of upper left corner of the box in Box2D meters.
     /// @param w_box width of the box in Box2D meters.
     /// @param h_box height of the box in Box2D meters.
     /// @param angle_box angle of the box in radians.
-    BoxEntity(b2World* world, SDL_Renderer* renderer, const char* path_to_texture, float x_box, float y_box, float w_box, float h_box, float angle_box);
+    BoxEntity(const char* path_to_texture, float x_box, float y_box, float w_box, float h_box, float angle_box);
     
+    /// Register this box in the world and set its texture. Should be 
+    /// called only when no world calculations are performing.
+    /// @param world link to the world where box should be registered.
+    /// @param renderer the rendering context.
+    void Register(b2World* world, SDL_Renderer* renderer);
+
     /// @brief Set default position and angle of the box.
     void Reset();
 
diff --git a/src/FontManager.h b/src/FontManager.h
index f1c449e..86f6175 100644
--- a/src/FontManager.h
+++ b/src/FontManager.h
@@ -2,3 +2,7 @@
 
 #include <SDL2/SDL.h>
 
+/// REALIZE
+/// ME
+/// ONE DAY
+/// PLEAAAAAAASE
diff --git a/src/PhysicsObj.cpp b/src/PhysicsObj.cpp
index e2664ff..32091f2 100644
--- a/src/PhysicsObj.cpp
+++ b/src/PhysicsObj.cpp
@@ -5,9 +5,9 @@ PhysicsObj::~PhysicsObj()
     SDL_DestroyTexture(PhysicsObj::texture);
 }
 
-void PhysicsObj::LoadTexture(SDL_Renderer* renderer, const char* path_to_texture)
+void PhysicsObj::LoadTexture(SDL_Renderer* renderer)
 {
-    PhysicsObj::texture = SDL_CreateTextureFromSurface(renderer, IMG_Load(path_to_texture));
+    PhysicsObj::texture = SDL_CreateTextureFromSurface(renderer, IMG_Load(PhysicsObj::pathToTexture));
 }
 
 b2Body* PhysicsObj::getBody()
diff --git a/src/PhysicsObj.h b/src/PhysicsObj.h
index a05f315..9c41f77 100644
--- a/src/PhysicsObj.h
+++ b/src/PhysicsObj.h
@@ -33,13 +33,21 @@ class PhysicsObj
     /// @brief Fixture definition of the physics object.
     b2FixtureDef fixtureDef;
 
+    /// @brief Path to the image file of texture.
+    const char* pathToTexture;
+
 public:
     ~PhysicsObj();
+    
+    /// Register this ph. obj. in the world and set its texture. Should be 
+    /// called only when no world calculations are performing.
+    /// @param world link to the world where ph. obj. should be registered.
+    /// @param renderer the rendering context.
+    virtual void Register(b2World* world, SDL_Renderer* renderer) = 0;
 
     /// @brief Load a texture for physics object.
-    /// @param renderer the rendering context, necessary in order to set texture.
-    /// @param path_to_texture path to the image file of texture.
-    void LoadTexture(SDL_Renderer* renderer, const char* path_to_texture);
+    /// @param renderer the rendering context.
+    void LoadTexture(SDL_Renderer* renderer);
 
     b2Body* getBody();
 
diff --git a/src/PlatformEntity.cpp b/src/PlatformEntity.cpp
index 495f0d0..eb44cca 100644
--- a/src/PlatformEntity.cpp
+++ b/src/PlatformEntity.cpp
@@ -1,6 +1,6 @@
 #include "PlatformEntity.h"
 
-PlatformEntity::PlatformEntity(b2World* world, float x1_plat, float y1_plat, float x2_plat, float y2_plat)
+PlatformEntity::PlatformEntity(float x1_plat, float y1_plat, float x2_plat, float y2_plat)
 {
     PlatformEntity::world = world;
     PlatformEntity::x1 = x1_plat;
@@ -10,12 +10,15 @@ PlatformEntity::PlatformEntity(b2World* world, float x1_plat, float y1_plat, flo
 
     b2Vec2 start_point = b2Vec2(PlatformEntity::x1, PlatformEntity::y1);
     b2Vec2 end_point = b2Vec2(PlatformEntity::x2, PlatformEntity::y2);
-
-    PlatformEntity::body = PlatformEntity::world->CreateBody(&bodyDef);
     
     PlatformEntity::platformShape.SetTwoSided(start_point, end_point);
 
     PlatformEntity::fixtureDef.shape = &(PlatformEntity::platformShape);
+}
+
+void PlatformEntity::Register(b2World* world, SDL_Renderer* renderer)
+{
+    PlatformEntity::body = world->CreateBody(&(PlatformEntity::bodyDef));
     PlatformEntity::body->CreateFixture(&(PlatformEntity::fixtureDef));
 }
 
diff --git a/src/PlatformEntity.h b/src/PlatformEntity.h
index aa0ba26..76b5cee 100644
--- a/src/PlatformEntity.h
+++ b/src/PlatformEntity.h
@@ -15,12 +15,17 @@ class PlatformEntity: public PhysicsObj
 
 public:
     /// @brief Create a new platform entity.
-    /// @param world the world where platform exists.
     /// @param x1_plat position X of the start point of the platform.
     /// @param y1_plat position Y of the start point of the platform.
     /// @param x2_plat position X of the end point of the platform.
     /// @param y2_plat position Y of the end point of the platform.
-    PlatformEntity(b2World* world, float x1_plat, float y1_plat, float x2_plat, float y2_plat);
+    PlatformEntity(float x1_plat, float y1_plat, float x2_plat, float y2_plat);
+
+    /// Register this platform in the world and set its texture. Should be 
+    /// called only when no world calculations are performing.
+    /// @param world link to the world where platform should be registered.
+    /// @param renderer the rendering context.
+    void Register(b2World* world, SDL_Renderer* renderer = nullptr);
 
     void Reset();
 
diff --git a/src/WorldManager.cpp b/src/WorldManager.cpp
index a16bb30..f916629 100644
--- a/src/WorldManager.cpp
+++ b/src/WorldManager.cpp
@@ -1,10 +1,10 @@
 #include "WorldManager.h"
 #include "Controls.h"
 
-WorldManager::WorldManager(int SCREEN_WIDTH, int SCREEN_HEIGHT, bool fpsCorrection, float move_speed, float zoom_speed)
+WorldManager::WorldManager(int WINDOW_WIDTH, int WINDOW_HEIGHT, bool fpsCorrection, float move_speed, float zoom_speed)
 {
-    WorldManager::SCREEN_WIDTH = SCREEN_WIDTH;
-    WorldManager::SCREEN_HEIGHT = SCREEN_HEIGHT;
+    WorldManager::WINDOW_WIDTH = WINDOW_WIDTH;
+    WorldManager::WINDOW_HEIGHT = WINDOW_HEIGHT;
 
     WorldManager::speedCorrection = fpsCorrection;
 
@@ -30,26 +30,26 @@ void WorldManager::initVideo()
 {
     SDL_Init(SDL_INIT_EVERYTHING);
 
-    if (WorldManager::SCREEN_WIDTH == 0 || WorldManager::SCREEN_HEIGHT == 0)
+    if (WorldManager::WINDOW_WIDTH == 0 || WorldManager::WINDOW_HEIGHT == 0)
     {
         SDL_DisplayMode dm;
         SDL_GetCurrentDisplayMode(0, &dm);
 
-        WorldManager::SCREEN_WIDTH = dm.w / 1.5;
-        WorldManager::SCREEN_HEIGHT = dm.h / 1.5;
+        WorldManager::WINDOW_WIDTH = dm.w / 1.5;
+        WorldManager::WINDOW_HEIGHT = dm.h / 1.5;
     }
 
     WorldManager::window = SDL_CreateWindow("Box2D", SDL_WINDOWPOS_CENTERED,
-        SDL_WINDOWPOS_CENTERED, WorldManager::SCREEN_WIDTH, WorldManager::SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
+        SDL_WINDOWPOS_CENTERED, WorldManager::WINDOW_WIDTH, WorldManager::WINDOW_HEIGHT, SDL_WINDOW_SHOWN);
     
     WorldManager::renderer = SDL_CreateRenderer(WorldManager::window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
 
-    SDL_RenderSetLogicalSize(WorldManager::renderer, WorldManager::SCREEN_WIDTH, WorldManager::SCREEN_HEIGHT);
+    SDL_RenderSetLogicalSize(WorldManager::renderer, WorldManager::WINDOW_WIDTH, WorldManager::WINDOW_HEIGHT);
 }
 
 void WorldManager::addObject(PhysicsObj* obj)
 {
-    WorldManager::objects.push_back(obj);
+    WorldManager::order.push_back(obj);
 }
 void WorldManager::deleteObject(int index)
 {
@@ -59,6 +59,13 @@ void WorldManager::deleteObject(int index)
 
 bool WorldManager::Step()
 {
+    for (int i = WorldManager::order.size() - 1; i >= 0; i--)
+    {
+        WorldManager::objects.push_back(WorldManager::order[i]);
+        WorldManager::objects[WorldManager::objects.size() - 1]->Register(WorldManager::world, WorldManager::renderer);
+        WorldManager::order.pop_back();
+    }
+        
     if (WorldManager::speedCorrection)
         WorldManager::b = WorldManager::a;
 
diff --git a/src/WorldManager.h b/src/WorldManager.h
index 41178ba..bae1327 100644
--- a/src/WorldManager.h
+++ b/src/WorldManager.h
@@ -9,11 +9,21 @@
 class WorldManager
 {
 private:
+    /// @brief Main Box2D world.
+    b2World* world;
+
+    /// @brief The rendering context.
+    SDL_Renderer* renderer;
+    
     /// Array of physics objects of the world. PhysicsObj is an abstract class and this array
     /// should only contain realizations of it (for example, BoxEntity).
     std::vector<PhysicsObj*> objects;
 
-    int SCREEN_WIDTH, SCREEN_HEIGHT;
+    /// Array of "ordered" physics objects that should be added to main ph. obj-s array when
+    /// no world calculations are performing.
+    std::vector<PhysicsObj*> order;
+
+    int WINDOW_WIDTH, WINDOW_HEIGHT;
 
     /// @brief Is WorldManager should adjust speed/FPS? Should be used only when there's need in this.
     bool speedCorrection;
@@ -33,12 +43,12 @@ class WorldManager
 
 public:
     /// @brief Init video, Box2D world and create WorldManager instance.
-    /// @param SCREEN_WIDTH resolution of the window width in pixels.
-    /// @param SCREEN_HEIGHT resolution of the window height in pixels.
+    /// @param WINDOW_WIDTH resolution of the window width in pixels. If 0, width would be adjusted automatically.
+    /// @param WINDOW_HEIGHT resolution of the window height in pixels. If 0, height would be adjusted automatically.
     /// @param fpsCorrection is WorldManager should adjust speed/FPS? Should be used only when there's need in this.
     /// @param move_speed amount of pixels added to camera offset variable in one frame when pressed relevant button.
     /// @param zoom_speed amount of coefficiency added to camera zoom variable in one frame when pressed relevant button.
-    WorldManager(int SCREEN_WIDTH, int SCREEN_HEIGHT, bool fpsCorrection = false, float move_speed = 10, float zoom_speed = 1);
+    WorldManager(int WINDOW_WIDTH, int WINDOW_HEIGHT, bool fpsCorrection = false, float move_speed = 10, float zoom_speed = 1);
     ~WorldManager();
 
     /// @brief Add physics object realization into the PhysicsObj array.
@@ -58,10 +68,4 @@ class WorldManager
 
     /// @brief Run main cycle of the program, exit only by initiative of user.
     void Cycle();
-    
-    /// @brief Main Box2D world.
-    b2World* world;
-
-    /// @brief The rendering context.
-    SDL_Renderer* renderer;
 };
diff --git a/src/main.cpp b/src/main.cpp
index 7fa63ad..c4d45be 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3,6 +3,8 @@
 #include "PlatformEntity.h"
 #include "WorldManager.h"
 
+#include <thread>
+
 #ifdef Linux
 const bool isLinux = true;
 #else
@@ -10,23 +12,23 @@ const bool isLinux = false;
 #endif
 
 #ifdef Vita
-int SCREEN_WIDTH = 960;
-int SCREEN_HEIGHT = 544;
+int WINDOW_WIDTH = 960;
+int WINDOW_HEIGHT = 544;
 #else
-int SCREEN_WIDTH = 0;
-int SCREEN_HEIGHT = 0;
+int WINDOW_WIDTH = 0;
+int WINDOW_HEIGHT = 0;
 #endif
 
 int main(int argv, char** args)
 {    
-    WorldManager* wm = new WorldManager(SCREEN_WIDTH, SCREEN_HEIGHT, isLinux);
+    WorldManager* wm = new WorldManager(WINDOW_WIDTH, WINDOW_HEIGHT, isLinux);
 
-    wm->addObject(new BoxEntity(wm->world, wm->renderer, "assets/img/box.png", 0, 0, 2, 2, 0));
-    wm->addObject(new BoxEntity(wm->world, wm->renderer, "assets/img/box.png", 2, 0, 2, 1, 45.0f));
-    wm->addObject(new BoxEntity(wm->world, wm->renderer, "assets/img/box.png", 5, 0, 0.25, 1.5, 45.0f));
-    wm->addObject(new BoxEntity(wm->world, wm->renderer, "assets/img/box.png", 5.5, 0, 0.25, 0.25, 45.0f));
+    wm->addObject(new PlatformEntity(0, 6, 8, 6));
 
-    wm->addObject(new PlatformEntity(wm->world, 0, 6, 8, 6));
+    wm->addObject(new BoxEntity("assets/img/box.png", 0, 0, 2, 2, 0));
+    wm->addObject(new BoxEntity("assets/img/box.png", 2, 0, 2, 1, 45.0f));
+    wm->addObject(new BoxEntity("assets/img/box.png", 5, 0, 0.25, 1.5, 45.0f));
+    wm->addObject(new BoxEntity("assets/img/box.png", 5.5, 0, 0.25, 0.25, 45.0f));
 
     wm->Cycle();