Let us start here, from square one. No, from Zero!

games/mga/mga.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include "games/game.h"
+
+namespace games::mga {
+
+    class MGAGame : public games::Game {
+    public:
+        MGAGame();
+        virtual void attach() override;
+        virtual void detach() override;
+    };
+}