diff --git a/SDK/include/NDK/Application.hpp b/SDK/include/NDK/Application.hpp
index 9b6eedae1..644dcc971 100644
--- a/SDK/include/NDK/Application.hpp
+++ b/SDK/include/NDK/Application.hpp
@@ -8,6 +8,10 @@
 #define NDK_APPLICATION_HPP
 
 #include <NDK/Prerequesites.hpp>
+#include <NDK/World.hpp>
+#include <Nazara/Core/Clock.hpp>
+#include <Nazara/Utility/Window.hpp>
+#include <vector>
 
 namespace Ndk
 {
@@ -15,7 +19,35 @@ namespace Ndk
 	{
 		public:
 			inline Application();
+			Application(const Application&) = delete;
 			inline ~Application();
+
+			#ifndef NDK_SERVER
+			template<typename T, typename... Args> T& AddWindow(Args&&... args);
+			#endif
+			template<typename... Args> World& AddWorld(Args&&... args);
+
+			bool Run();
+
+			inline void Quit();
+
+			Application& operator=(const Application&) = delete;
+
+			inline static Application* Instance();
+
+		private:
+			#ifndef NDK_SERVER
+			std::vector<std::unique_ptr<Nz::Window>> m_windows;
+			#endif
+			std::vector<World> m_worlds;
+			Nz::Clock m_updateClock;
+			#ifndef NDK_SERVER
+			bool m_exitOnClosedWindows;
+			#endif
+			bool m_shouldQuit;
+			float m_updateTime;
+
+			static Application* s_application;
 	};
 }
 
diff --git a/SDK/include/NDK/Application.inl b/SDK/include/NDK/Application.inl
index dafbd54d8..690cf54d3 100644
--- a/SDK/include/NDK/Application.inl
+++ b/SDK/include/NDK/Application.inl
@@ -3,12 +3,21 @@
 // For conditions of distribution and use, see copyright notice in Prerequesites.hpp
 
 #include <Nazara/Core/ErrorFlags.hpp>
+#include <type_traits>
 #include <NDK/Sdk.hpp>
 
 namespace Ndk
 {
-	inline Application::Application()
+	inline Application::Application() :
+	#ifndef NDK_SERVER
+	m_exitOnClosedWindows(true),
+	#endif
+	m_shouldQuit(false),
+	m_updateTime(0.f)
 	{
+		NazaraAssert(s_application == nullptr, "You can create only one application instance per program");
+		s_application = this;
+
 		Nz::ErrorFlags errFlags(Nz::ErrorFlag_ThrowException, true);
 
 		// Initialisation du SDK
@@ -21,5 +30,32 @@ namespace Ndk
 		Sdk::Uninitialize();
 
 		// Libération automatique des modules
+		s_application = nullptr;
+	}
+
+	template<typename T, typename... Args> 
+	T& Application::AddWindow(Args&&... args)
+	{
+		static_assert(std::is_base_of<Nz::Window, T>::value, "Type must inherit Window");
+
+		m_windows.emplace_back(new T(std::forward<Args>(args)...));
+		return static_cast<T&>(*m_windows.back().get());
+	}
+
+	template<typename... Args> 
+	World& Application::AddWorld(Args&&... args)
+	{
+		m_worlds.emplace_back(std::forward<Args>(args)...);
+		return *m_worlds.back();
+	}
+
+	inline void Application::Quit()
+	{
+		m_shouldQuit = true;
+	}
+
+	inline Application* Application::Instance()
+	{
+		return s_application;
 	}
 }
diff --git a/SDK/src/NDK/Application.cpp b/SDK/src/NDK/Application.cpp
index a2141b0f8..e15ba2f92 100644
--- a/SDK/src/NDK/Application.cpp
+++ b/SDK/src/NDK/Application.cpp
@@ -3,3 +3,47 @@
 // For conditions of distribution and use, see copyright notice in Prerequesites.hpp
 
 #include <NDK/Application.hpp>
+
+namespace Ndk
+{
+	bool Application::Run()
+	{
+		#ifndef NDK_SERVER
+		bool hasAtLeastOneActiveWindow = false;
+
+		auto it = m_windows.begin();
+		while (it != m_windows.end())
+		{
+			Nz::Window& window = **it;
+
+			if (!window.IsOpen(true))
+			{
+				it = m_windows.erase(it);
+				continue;
+			}
+
+			hasAtLeastOneActiveWindow = true;
+
+			++it;
+		}
+		#endif
+
+		float elapsedTime = m_updateClock.GetSeconds();
+		m_updateClock.Restart();
+
+		for (World& world : m_worlds)
+			world.Update(elapsedTime);
+
+		if (m_shouldQuit)
+			return false;
+
+		#ifndef NDK_SERVER
+		if (m_exitOnClosedWindows && !hasAtLeastOneActiveWindow)
+			return false;
+		#endif
+
+		return true;
+	}
+
+	Application* Application::s_application = nullptr;
+}
\ No newline at end of file