Yoshi's Cookie

Cheats

Harder Game
Use this trick to play against more challenging characters in the Vs. Mode.
First, set the Mode to COM. Then, on Controller One, press L + R + X + Start.
If you hear the word "Yoshi's," the code worked. When you begin your game,
everything will seem the same until the computer contestant appears. You'll
notice that it's changed colors, indicating a tougher opponent.

Level Select
This code lets you select any round from 11 to 99 and change your playing
pieces as well.

At the title screen, select Action Mode and press START. Set Round to 10,
Speed to High, and Music to off. Use Controller Two to press L + R + Select
+ Start. If you hear the word "Yoshi," the trick worked.