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

games/onpara/io.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <vector>
+#include "cfg/api.h"
+
+namespace games::onpara {
+    namespace Buttons {
+        enum {
+            Service,
+            Test,
+            Start,
+            Headphone,
+        };
+    }
+
+    std::vector<Button> &get_buttons();
+}