Yoshi's Safari Cheats
Hold X + Y + L + R and press Start at the title screen. The screen color will change to confirm correct code entry.
Press X, Y, R, L, Start at the title screen. The screen will fade and return with a pink sky.
If you have beaten Yoshi's Safari, you will find out a code for a new quest in the game. Here it is. At the Title Screen, take controller 1 and press and hold the top L button, the top R button, X, Y, and START simultaneously. If the background has changed from blue to purple, you'll know the trick worked. Now, the Princess will tell you of another quest that she would like you to complete. Mario's work is never done!