After turning on Automatic Play mode, hold Start when turning on the Nintendo DS to return to the main menu instead of starting the game.
Birthday Greeting
Enter a chat room in PictoChat on the date that you entered as your birthday in the system settings. The message "Happy Birthday! Today is [your name's] birthday!" will appear. The starting sound of the DS will also change on your birthday.
Game Boy Advance In-game Reset
Hold A + B + Start + Select during game play in a Game Boy Advance game to return to its title screen.
In-game Reset
Hold L + R + Start + Select during game play in a Nintendo DS game to return to its title screen.
Quick Game Boy Advance Start
With both a Game Boy Advance and Nintendo DS game inserted, hold B when turning on the Nintendo DS.
It will advance directly to the Game Boy Advance games without the usual warning screens.