-extern timer_type super_bkgd_timer;
-extern float scroll_x;
-extern int global_frame_counter;
-extern std::vector<bouncy_distro_type> bouncy_distros;
-extern std::vector<broken_brick_type> broken_bricks;
-extern std::vector<bouncy_brick_type> bouncy_bricks;
-extern std::vector<BadGuy> bad_guys;
-extern std::vector<floating_score_type> floating_scores;
-extern std::vector<upgrade_type> upgrades;
-extern std::vector<bullet_type> bullets;
-extern Player tux;
-extern texture_type img_box_full, img_box_empty, img_mints, img_coffee, img_super_bkgd, img_red_glow;
-extern timer_type time_left;
-extern double frame_ratio;