file = get_open_filename(нужные_аргументы);
sprite = sprite_add(file, нужные_аргументы);
object.sprite_index = sprite; //object - объект, которому нужно сменить спрайт

x = median(x, 0, room_width);
y = median(y, 0, room_height);

if place_free(x + 32, y) x += 32;

if keyboard_check(vk_left) {  
     if place_free(x - 4, y) {  
        x -= 4;  
     } else {  
         n = instance_place(x - 1, y, objBox);
         with n {  
             if place_free(x - 4, y) {  
                 x -= 4;  
                 other.x -= 4;  
             }  
         }  
     }  
}

target = noone;

visible = !(target == noone);
if target != noone {
     x = target.x;
     y = target.y;
}

globalvar metka;
metka = instance_create(0, 0, objMetka);

if mouse_check_button_pressed(mb_left) {
     if position_meeting(mouse_x, mouse_y, id)
     metka.target = id;
     else
     metka.target = noone;
}