The Death and Return of Superman code fragment

    wait_until_0();

    // zone 4
    next_zone((166*8));

    make_banjo_rgt(0);
    make_molatav_lft(0);
    wait_until_0();
    make_bike_lft(0);
    make_banjo_rgt(20);
    wait_while_3();
    make_molatav_rgt(-20);
    wait_until_0();

    // zone 5
    next_zone((226*8));

    make_molatav_rgt(0);
    make_banjo_lft(0);
    wait_while_2();
    make_molatav_lft(0);
    make_banjo_rgt(0);
    wait_while_3();
    make_molatav_rgt(0);
    wait_until_0();

    // zone 6
    next_zone((278*8));

    make_banjo_lft(0);
    make_molatav_rgt(0);
    wait_until_0();
    make_bike_rgt(0);
    make_banjo_lft(20);
    wait_while_3();
    make_molatav_rgt(-20);
    wait_until_0();

    sleep((20));
    l.msg = MSG_EXIT_STAGE;
    nap_loop();
}

t_coast3()
{
    g.break_offset = 17;
    g.glass_offset = 0;

    g.floor = ((38*8)-1);
//goto skip;

    // zone 1
    next_zone((10*8));

    choose_guard_left();
    make_robot_rgt(0);
    wait_while_2();
    make_tick_ship1();
    wait_until_0();

    // zone 2
    next_zone((54*8));

    choose_guard_left();
    make_robot_rgt(30);
    wait_while_2();
    choose_guard_left();
    choose_guard_right();
    wait_while_3();
    wait_while_2();
    sleep(1);
    make_tick_ship1();
    wait_until_0();

    // globes
    next_zone((84*8));
    do_globes(25);
    wait_until_0();

    // zone 3
    next_zone((130*8));

    choose_guard_left();
    make_tick_ship1();
    wait_while_3();
    make_robot_rgt(-30);
    wait_while_3();
    choose_guard_left();
    wait_until_0();

    // zone 4
    next_zone((218*8));

    make_robot_rgt(30);
    choose_guard_left();
    choose_guard_right();
    wait_while_3();
    make_tick_rgt(30);
    wait_while_3();
    choose_guard_left();
    wait_until_0();

    // zone 5
    next_zone((272*8));

skip:
    sleep(10);
    boss_song();
    make_object(CYBR_BOSS_OBJ, RIGHT_SIDE, g.floor, 0, 0, 0);
    wait_until_0();

    land_man();

    g.start_combat = 1;
    l.msg = MSG_EXIT_STAGE;
    l.parm = o.child;
    nap_loop();
}

t_missile()
{
    g.script_collide_pad = 24;

    g.floor = 0;
    g.break_offset = 21;

    o.local = 0xfffe;

    o.local3 = 0;

    g.orbs_killed = 0;
    o.health = 0;

    sleep((20*3));

    do {
        reg = g.orbs_killed + 2;
        if (reg >= o.health) o.health = g.orbs_killed;
        o.local2 = 2;
        do {
            make_object(ORB_OBJ, RIGHT_SIDE, (VISIBLE_HGT/2), 0, 0, o.local3);
            sleep(7);
            o.local2--;
        } while (o.local2 != 0);
        o.local3++;

        sleep(40);
        reg = o.health + 2;
        if (reg == g.orbs_killed) {
            o.health = reg + 12;
            if (l.top < (112-16)) o.local2 = (112+33);
            else o.local2 = (112-32);
            make_object(HEALTH_POWERUP_OBJ, (VISIBLE_WDT), o.local2, 0, 0, 2);
        }
        else o.health = 0;
    } while (g.missile_parts != -1);
    nap_loop();
}

t_level8a()
{
    g.break_offset = 40;
    g.mode = FLYING;
    o.local = 0xfffe;

    g.low_z_bound = l.in;
    g.high_z_bound = l.out;

    if (g.current_map == LEVEL08B_MAP) {
        do {
            if (o.health == 0) {
                sleep(50);
                make_object(EYE_OBJ, RIGHT_SIDE, 112, 0, 0, 0);
            }
            sleep(1);
        } while (g.mscroll_pixel_x != g.map_pixel_rgt);

        sleep(10);
        boss_song();
        g.missile_parts = 1;
        play_sound(SFX_DOOM_LAUGH);

        do {
            make_object(EYE_OBJ, RIGHT_SIDE, 112, 0, 0, 0);
            sleep(10);
            do sleep(1); while (o.health == 3);
        } while (g.missile_parts != -1);
        g.disable_joypad = 1;
    }

    nap_loop();
}

t_default()
{
    g.floor = 0;

    next_zone(g.map_pixel_rgt - 9);
    teleport();
}


public next_zone(o.local)
{
    reg = g.map_pixel_rgt + 322;    //because map_pixel_rgt is left edge of rightmost screen
    if (reg < o.local) teleport();

next_zone_no_teleport::

    g.open_door = 0;

    o.timer = ARROW_DELAY;

    o.local3 = o.local - 8;
    do {
        sleep(1);
    } while (o.x < o.local3 || o.health != 0);

    o.timer = 0;
}

*_default);
/*****/
    switch (g.current_map) {
        case LEVEL01A_MAP: init_thread(t_factory1); break;
        case LEVEL01B_MAP: init_thread(t_factory2);
                   break;
        case LEVEL01C_MAP: init_thread(t_factory3);
            g.teleport_map = TOON2_1_MAP;
            break;
        case LEVEL02A_MAP: init_thread(t_city1); break;
        case LEVEL02B_MAP: init_thread(t_city2);
            g.teleport_map = TOON