Super Mario Advance
Cheats/codes, tips & tricks

Erase all data
To erase all saved data at once, press and hold Select + Start + L + R + B + A during the "GAME BOY" boot-up screen. Keep holding the buttons, and the screen should go black for a second or two, and then you'll have to answer yes or no to the "Erase all saved data?" question.

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Unlock Yoshi's Challenge
In Super Mario 2 mode, beat Wart in World 7-2 to unlock Yoshi's Challenge. Warping is OK. Make sure you let the credits roll, and Save and Quit at the end. After that, the sky in the title screen should now be kinda red/tan, with a moving Yoshi Egg in the lower-right corner, and the file you beat Wart with will say "Extra" instead of "World." The "Yoshi Challenge" is to find (and pick up) the two Yoshi Eggs that are hidden in Sub-Space in each level, and then beat the level.