diff --git a/src/citymania/cm_survey.cpp b/src/citymania/cm_survey.cpp
new file mode 100644
index 0000000000..dc8a403f13
--- /dev/null
+++ b/src/citymania/cm_survey.cpp
@@ -0,0 +1,17 @@
+#include "../stdafx.h"
+
+#include "cm_survey.hpp"
+
+#include "../openttd.h"
+
+#include "../safeguards.h"
+
+namespace citymania {
+
+void SurveyGameSession(nlohmann::json &survey) {
+    for (auto& [key, value]: _game_session_stats.cm.hotkeys) {
+        survey["cm_hotkeys"][key] = value;
+    }
+}
+
+} // namespace citymania
diff --git a/src/citymania/cm_survey.hpp b/src/citymania/cm_survey.hpp
new file mode 100644
index 0000000000..67e074a30b
--- /dev/null
+++ b/src/citymania/cm_survey.hpp
@@ -0,0 +1,12 @@
+#ifndef CMEXT_SURVEY_HPP
+#define CMEXT_SURVEY_HPP
+
+#include "3rdparty/nlohmann/json.hpp"
+
+namespace citymania {
+
+void SurveyGameSession(nlohmann::json &survey);
+
+} // namespace citymania
+
+#endif
diff --git a/src/citymania/extensions/cmext_game_session_stats.hpp b/src/citymania/extensions/cmext_game_session_stats.hpp
new file mode 100644
index 0000000000..2b30beb690
--- /dev/null
+++ b/src/citymania/extensions/cmext_game_session_stats.hpp
@@ -0,0 +1,17 @@
+#ifndef CMEXT_GAME_SESSION_STATS_HPP
+#define CMEXT_GAME_SESSION_STATS_HPP
+
+namespace citymania {
+
+namespace ext {
+
+class GameSessionStats {
+public:
+    std::map<std::string, uint> hotkeys;
+};
+
+} // namespace ext
+
+} // namespace citymania
+
+#endif