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

games/pcm/pcm.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "games/game.h"
+
+namespace games::pcm {
+    class PCMGame : public Game {
+    public:
+        PCMGame();
+
+        void attach() override;
+    };
+}