diff --git a/Bonus.h b/Bonus.h
index 4c81549..7a082eb 100644
--- a/Bonus.h
+++ b/Bonus.h
@@ -8,7 +8,7 @@
 #include "engine/World.h"
 #include "Player.h"
 
-class Bonus : public RigidBody {
+class Bonus final : public RigidBody {
 protected:
     std::string _name;
 public:
diff --git a/Client.h b/Client.h
index 77de858..7da3b56 100644
--- a/Client.h
+++ b/Client.h
@@ -8,7 +8,7 @@
 #include "engine/network/ClientUDP.h"
 #include "Player.h"
 
-class Client : public ClientUDP {
+class Client final : public ClientUDP {
 private:
     std::map<sf::Uint16, std::shared_ptr<Player>> _players{};
     std::shared_ptr<Player> _player;
diff --git a/Player.h b/Player.h
index 53c9c14..97be75d 100644
--- a/Player.h
+++ b/Player.h
@@ -16,7 +16,7 @@
 #include "weapon/Gold_Ak47.h"
 #include "weapon/Rifle.h"
 
-class Player : public RigidBody{
+class Player final : public RigidBody{
 private:
     double _healthMax = 100;
     double _health = _healthMax;
diff --git a/PlayerController.h b/PlayerController.h
index 77e6bfb..2d21001 100644
--- a/PlayerController.h
+++ b/PlayerController.h
@@ -9,7 +9,7 @@
 #include "engine/Keyboard.h"
 #include "engine/Mouse.h"
 
-class PlayerController {
+class PlayerController final {
 private:
     std::shared_ptr<Player> _player;
     std::shared_ptr<Keyboard> _keyboard;
diff --git a/Server.h b/Server.h
index 65a35d3..778db21 100644
--- a/Server.h
+++ b/Server.h
@@ -15,7 +15,7 @@ struct BonusInfo {
     bool onTheMap = false;
 };
 
-class Server : public ServerUDP {
+class Server final : public ServerUDP {
 private:
     std::map<sf::Uint16, std::shared_ptr<Player>> _players{};
     std::map<std::string, BonusInfo> _bonuses{};
diff --git a/Shooter.h b/Shooter.h
index 729e119..cc91ff5 100644
--- a/Shooter.h
+++ b/Shooter.h
@@ -15,7 +15,7 @@
 #include "Server.h"
 
 
-class Shooter : public Engine {
+class Shooter final : public Engine {
 private:
     std::shared_ptr<Player> player;
     std::shared_ptr<PlayerController> playerController;
diff --git a/engine/Camera.h b/engine/Camera.h
index 69d60fe..95b66db 100644
--- a/engine/Camera.h
+++ b/engine/Camera.h
@@ -10,7 +10,7 @@
 #include "Plane.h"
 #include "Mesh.h"
 
-class Camera : public Object{
+class Camera final : public Object{
 private:
     Matrix4x4 _S; // screen space matrix
     Matrix4x4 _P; // projections matrix
diff --git a/engine/Keyboard.h b/engine/Keyboard.h
index b5b96ef..fe9560c 100644
--- a/engine/Keyboard.h
+++ b/engine/Keyboard.h
@@ -7,7 +7,7 @@
 
 #include <SFML/Graphics.hpp>
 
-class Keyboard {
+class Keyboard final {
 private:
     std::map<sf::Keyboard::Key, double> _tappedKeys;
 public:
diff --git a/engine/Matrix4x4.h b/engine/Matrix4x4.h
index 6bbe1e3..5625162 100644
--- a/engine/Matrix4x4.h
+++ b/engine/Matrix4x4.h
@@ -9,7 +9,7 @@
 #include "Point4D.h"
 #include "Vec3D.h"
 
-class Matrix4x4 {
+class Matrix4x4 final {
 private:
     std::array<std::array<double, 4>, 4> _arr{};
 
diff --git a/engine/Mouse.h b/engine/Mouse.h
index 6101916..f76eb23 100644
--- a/engine/Mouse.h
+++ b/engine/Mouse.h
@@ -9,7 +9,7 @@
 #include <SFML/Graphics.hpp>
 #include "Vec2D.h"
 
-class Mouse {
+class Mouse final {
 private:
     std::shared_ptr<sf::RenderWindow> _window;
 
diff --git a/engine/Plane.h b/engine/Plane.h
index 9c49909..a3b16de 100644
--- a/engine/Plane.h
+++ b/engine/Plane.h
@@ -8,7 +8,7 @@
 #include "Point4D.h"
 #include "Triangle.h"
 
-class Plane {
+class Plane final {
 private:
     // You can define plane by defining the points in 3D space
     Triangle _triangle;
diff --git a/engine/Point4D.h b/engine/Point4D.h
index 9a1c984..74fa854 100644
--- a/engine/Point4D.h
+++ b/engine/Point4D.h
@@ -8,7 +8,7 @@
 #include <array>
 #include "Consts.h"
 
-class Point4D {
+class Point4D final {
 private:
     std::array<double, 4> _arr_point{};
 
diff --git a/engine/Screen.h b/engine/Screen.h
index 55aa506..bcabaf6 100644
--- a/engine/Screen.h
+++ b/engine/Screen.h
@@ -13,7 +13,7 @@
 #include "utils/Time.h"
 #include "Mouse.h"
 
-class Screen {
+class Screen final {
 private:
     int _w = 1920;
     int _h = 1080;
diff --git a/engine/Triangle.h b/engine/Triangle.h
index 545ea2b..0b92632 100644
--- a/engine/Triangle.h
+++ b/engine/Triangle.h
@@ -10,12 +10,11 @@
 #include "Matrix4x4.h"
 #include <SFML/Graphics.hpp>
 
-class Triangle {
+class Triangle final {
 private:
     sf::Color _color;
     std::vector<Point4D> _points;
 public:
-
     Triangle ();
     Triangle (const Triangle& triangle);
     Triangle (const Point4D& p1, const Point4D& p2, const Point4D& p3, sf::Color color = {0, 0, 0});
diff --git a/engine/Vec2D.h b/engine/Vec2D.h
index 04100ab..d86a01d 100644
--- a/engine/Vec2D.h
+++ b/engine/Vec2D.h
@@ -9,14 +9,14 @@
 #include <array>
 #include "Point4D.h"
 
-class Vec2D {
+class Vec2D final {
 private:
     std::array<double, 2> _arr_point{};
 
 public:
     Vec2D () = default;
     Vec2D (const Vec2D& vec);
-    Vec2D (const Point4D& point4D);
+    explicit Vec2D (const Point4D& point4D);
     explicit Vec2D (double x, double y = 0.0);
     Vec2D& operator=(const Vec2D&) = delete;
 
diff --git a/engine/Vec3D.h b/engine/Vec3D.h
index d315067..f49a3fb 100644
--- a/engine/Vec3D.h
+++ b/engine/Vec3D.h
@@ -8,7 +8,7 @@
 #include <array>
 #include "Point4D.h"
 
-class Vec3D {
+class Vec3D final {
 private:
     std::array<double, 3> _arr_point{};
 
diff --git a/engine/World.h b/engine/World.h
index b1de54d..1fa6875 100644
--- a/engine/World.h
+++ b/engine/World.h
@@ -9,7 +9,7 @@
 #include "Camera.h"
 #include "physics/RigidBody.h"
 
-class World {
+class World final {
 private:
     std::map<std::string, std::shared_ptr<RigidBody>> _objects;
 public:
diff --git a/engine/animation/AColor.h b/engine/animation/AColor.h
index fe7d37a..0be6054 100644
--- a/engine/animation/AColor.h
+++ b/engine/animation/AColor.h
@@ -8,7 +8,7 @@
 #include "Animation.h"
 #include "../Mesh.h"
 
-class AColor : public Animation {
+class AColor final : public Animation {
 private:
     std::shared_ptr<Mesh> _mesh;
 
diff --git a/engine/animation/AFunction.h b/engine/animation/AFunction.h
index 4b8fe28..f5abd45 100644
--- a/engine/animation/AFunction.h
+++ b/engine/animation/AFunction.h
@@ -9,7 +9,7 @@
 #ifndef ENGINE_AFUNCTION_H
 #define ENGINE_AFUNCTION_H
 
-class AFunction : public Animation {
+class AFunction final : public Animation {
 private:
     int _calls = 0;
     int _allCalls = 1;
diff --git a/engine/animation/ARotate.h b/engine/animation/ARotate.h
index 84335d1..7b15271 100644
--- a/engine/animation/ARotate.h
+++ b/engine/animation/ARotate.h
@@ -8,7 +8,7 @@
 #include "Animation.h"
 #include "../Object.h"
 
-class ARotate : public Animation {
+class ARotate final : public Animation {
 private:
     std::shared_ptr<Object> _object;
 
diff --git a/engine/animation/AScale.h b/engine/animation/AScale.h
index 8cf528f..c4d9926 100644
--- a/engine/animation/AScale.h
+++ b/engine/animation/AScale.h
@@ -9,7 +9,7 @@
 #include "Animation.h"
 #include "Mesh.h"
 
-class AScale : public Animation {
+class AScale final : public Animation {
 private:
     std::shared_ptr<Mesh> _mesh;
 
diff --git a/engine/animation/ATranslate.h b/engine/animation/ATranslate.h
index 17f2b9d..f3693f2 100644
--- a/engine/animation/ATranslate.h
+++ b/engine/animation/ATranslate.h
@@ -8,7 +8,7 @@
 #include "Animation.h"
 #include "../Object.h"
 
-class ATranslate : public Animation {
+class ATranslate final : public Animation {
 private:
     std::shared_ptr<Object> _object;
 
diff --git a/engine/animation/ATranslateToPoint.h b/engine/animation/ATranslateToPoint.h
index 4ea0a41..de7efc3 100644
--- a/engine/animation/ATranslateToPoint.h
+++ b/engine/animation/ATranslateToPoint.h
@@ -8,7 +8,7 @@
 #include "Animation.h"
 #include "../Object.h"
 
-class ATranslateToPoint : public Animation {
+class ATranslateToPoint final : public Animation {
 private:
     std::shared_ptr<Object> _object;
 
diff --git a/engine/animation/AWait.h b/engine/animation/AWait.h
index 367d725..e45d457 100644
--- a/engine/animation/AWait.h
+++ b/engine/animation/AWait.h
@@ -7,7 +7,7 @@
 
 #include "Animation.h"
 
-class AWait : public Animation {
+class AWait final : public Animation {
 public:
     explicit AWait(double duration = 1) {
         _duration = duration;
diff --git a/engine/gui/Button.h b/engine/gui/Button.h
index bd04b51..21e4223 100644
--- a/engine/gui/Button.h
+++ b/engine/gui/Button.h
@@ -14,7 +14,7 @@ struct tPos {
     int ty;
 };
 
-class Button {
+class Button final {
 private:
     int _x{};
     int _y{};
diff --git a/engine/gui/Window.h b/engine/gui/Window.h
index 7592e10..679ee4a 100644
--- a/engine/gui/Window.h
+++ b/engine/gui/Window.h
@@ -12,7 +12,7 @@
 #include "../Screen.h"
 #include "../Mouse.h"
 
-class Window {
+class Window final {
 private:
     std::string _name;
     std::string _backTexture;
diff --git a/engine/network/ReliableMsg.h b/engine/network/ReliableMsg.h
index 38488fa..6a233a7 100644
--- a/engine/network/ReliableMsg.h
+++ b/engine/network/ReliableMsg.h
@@ -7,7 +7,7 @@
 
 #include <SFML/Network.hpp>
 
-class ReliableMsg
+class ReliableMsg final
 {
 private:
     sf::Packet packet;
diff --git a/engine/network/UDPConnection.h b/engine/network/UDPConnection.h
index 9521583..e5fe12c 100644
--- a/engine/network/UDPConnection.h
+++ b/engine/network/UDPConnection.h
@@ -7,8 +7,7 @@
 
 #include <SFML/Network.hpp>
 
-class UDPConnection
-{
+class UDPConnection final {
 private:
     sf::Uint16 _id;
     sf::IpAddress _ip;
diff --git a/engine/network/UDPSocket.h b/engine/network/UDPSocket.h
index 8b997da..7ba116c 100644
--- a/engine/network/UDPSocket.h
+++ b/engine/network/UDPSocket.h
@@ -12,8 +12,7 @@
 #include "UDPConnection.h"
 #include "MsgType.h"
 
-class UDPSocket
-{
+class UDPSocket final {
 private:
     sf::UdpSocket _socket;
     sf::Uint16 _nextRelyMsgId;
diff --git a/engine/physics/Simplex.h b/engine/physics/Simplex.h
index cae6ce7..b02918b 100644
--- a/engine/physics/Simplex.h
+++ b/engine/physics/Simplex.h
@@ -16,7 +16,7 @@ enum class SimplexType {
     Tetrahedron
 };
 
-struct Simplex {
+struct Simplex final {
 private:
     std::deque<Vec3D> _points{};
 
diff --git a/engine/physics/Solver.h b/engine/physics/Solver.h
index 6392009..d2b95a1 100644
--- a/engine/physics/Solver.h
+++ b/engine/physics/Solver.h
@@ -7,7 +7,7 @@
 
 #include "RigidBody.h"
 
-class Solver {
+class Solver final {
 public:
     static void solveCollision(std::shared_ptr<RigidBody> obj1, std::shared_ptr<RigidBody> obj2, const CollisionPoint& collision);
 };
diff --git a/weapon/Ak47.h b/weapon/Ak47.h
index a9274b4..578bf9f 100644
--- a/weapon/Ak47.h
+++ b/weapon/Ak47.h
@@ -7,7 +7,7 @@
 
 #include "Weapon.h"
 
-class Ak47 : public Weapon {
+class Ak47 final : public Weapon {
 public:
     explicit Ak47(int ammo = 100, const std::string& weaponName = "ak47");
 };
diff --git a/weapon/Gold_Ak47.h b/weapon/Gold_Ak47.h
index 28ddc60..7f2cbae 100644
--- a/weapon/Gold_Ak47.h
+++ b/weapon/Gold_Ak47.h
@@ -7,7 +7,7 @@
 
 #include "Weapon.h"
 
-class Gold_Ak47 : public Weapon {
+class Gold_Ak47 final : public Weapon {
 public:
     explicit Gold_Ak47(int ammo = 200, const std::string& weaponName = "gold_ak47") : Weapon(weaponName, "obj/ak47.obj", "obj/gold_ak47_mat.txt", Vec3D{3, 3, 3}, Vec3D{-0.8, 1.3, 0.3}, Vec3D{0, Consts::PI, 0}) {
         fireSound.setBuffer(*ResourceManager::loadSoundBuffer("sound/weapons/ak47.ogg"));
diff --git a/weapon/Gun.h b/weapon/Gun.h
index db5a25a..07900c7 100644
--- a/weapon/Gun.h
+++ b/weapon/Gun.h
@@ -7,7 +7,7 @@
 
 #include "Weapon.h"
 
-class Gun : public Weapon {
+class Gun final : public Weapon {
 public:
     explicit Gun(int ammo = 30, const std::string& weaponName = "gun");
 };
diff --git a/weapon/Rifle.h b/weapon/Rifle.h
index eb1e269..8cabfc6 100644
--- a/weapon/Rifle.h
+++ b/weapon/Rifle.h
@@ -7,7 +7,7 @@
 
 #include "Weapon.h"
 
-class Rifle : public Weapon {
+class Rifle final : public Weapon {
 public:
     explicit Rifle(int ammo = 5, const std::string& weaponName = "rifle");
 };
diff --git a/weapon/Shotgun.h b/weapon/Shotgun.h
index e54d0ec..7fc6f6f 100644
--- a/weapon/Shotgun.h
+++ b/weapon/Shotgun.h
@@ -7,7 +7,7 @@
 
 #include "Weapon.h"
 
-class Shotgun : public Weapon {
+class Shotgun final : public Weapon {
 public:
     explicit Shotgun(int ammo = 15, const std::string& weaponName = "shotgun");
     std::map<std::string, double> processFire(std::function<std::pair<Vec3D, std::string>(const Vec3D&, const Vec3D&)> rayCastFunction, const Vec3D& position, const Vec3D& direction) override;