Nintendo DS hardware - Platform: Nintendo DS

Game Boy Advance In-game Reset:
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Hold A + B + Start + Select during game play in a Game Boy Advance game to return to its 
title screen.

Birthday greeting:
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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.

Abort Automatic Play Mode:
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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.

Quick Game Boy Advance Start:
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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.

In-game Reset:
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Hold L + R + Start + Select during game play in a Nintendo DS game to return to its title screen.