+ * enable/disable worldmap ghost mode
+ */
+void debug_worldmap_ghost(bool enable);
+
+/**
+ * Changes music to musicfile
+ */
+void play_music(const std::string& musicfile);
+
+/**
+ * Plays a soundfile
+ */
+void play_sound(const std::string& soundfile);
+
+/**
+ * Set the game_speed
+ */
+void set_game_speed(float speed);
+
+/**