if (obj_mainchara.bbox_top < 125)
    level = 2;
else
    level = 1;
if (instance_exists(block[0]))
{
    with (block[0])
        instance_destroy();
    with (block[1])
        instance_destroy();
    with (block[2])
        instance_destroy();
    with (block[3])
        instance_destroy();
    with (block[5])
        instance_destroy();
    with (block[6])
        instance_destroy();
    if (dogdoor != -4)
    {
        with (dogdoor)
            instance_destroy();
        dogdoor = -4;
    }
}
if (instance_exists(block[4]) == 0)
    block[4] = instance_create(83, 90, obj_solidlong);