diff --git a/source/core/defaults.hpp b/source/core/defaults.hpp
index d8f581b..7f04d7a 100644
--- a/source/core/defaults.hpp
+++ b/source/core/defaults.hpp
@@ -16,6 +16,7 @@ constexpr int MIN_HEIGHT = 240;
 constexpr float BASE_ZOOM = 1.0F;       // 640x480 baseline
 constexpr float MIN_ZOOM = 0.5F;        // 320x240 minimum
 constexpr float ZOOM_INCREMENT = 0.1F;  // 10% steps (F1/F2)
+constexpr bool FULLSCREEN = true;       // Pantalla completa activadapor defecto
 }  // namespace Window
 
 // Dimensions base del joc (coordenades lògiques)
diff --git a/source/game/options.cpp b/source/game/options.cpp
index f634554..963835a 100644
--- a/source/game/options.cpp
+++ b/source/game/options.cpp
@@ -189,7 +189,7 @@ void init() {
     // Window
     window.width = Defaults::Window::WIDTH;
     window.height = Defaults::Window::HEIGHT;
-    window.fullscreen = false;
+    window.fullscreen = Defaults::Window::FULLSCREEN;
     window.zoom_factor = Defaults::Window::BASE_ZOOM;
 
     // Physics