-extern Surface* img_super_bkgd;
-extern Surface* tux_life;
-
-extern SpriteManager* sprite_manager;
-extern TileManager* tile_manager;
-
-extern Menu* contrib_menu;
-extern Menu* contrib_subset_menu;
-extern Menu* main_menu;
-extern Menu* game_menu;
-extern Menu* options_menu;
-extern Menu* load_game_menu;
-