checked-yes
see also
SUPER MARIO BROS. (nes)
=>Save Your Progress: Once you lose all your lives and the GAME OVER screen
appears, return to the title screen. Press [L]+[R] and choose to Save High
Score. From now on, you can continue from the last world you reached by
simply holding A and pressing [START] on the title screen, even if you turn
your GBA off.
=>Delete All Saved Data: Hold [L]+[R] while turning on the GBA. A menu will
appear, asking if you'd like to erase all saved data.