First open the code menu by opening the skills mode and then pressing and holding the X and Y buttons while you press up on the control stick and down on the camera pad at the same time. You'll hear the crowd roaring and a new option, controller stress test will appear. Click on the option and enter these codes for the desired cheat.

Codes

Left, Right, Left, Right, X, Y, Left Little Guys

Left, Right, Left, Right, X, Y, Right Big Heads

Left, Right, Left, Right, X, Y, Up Little Heads

Left, Right, Left, Right, X, Y, Down Big Hands

Left, Right, Left, Right, Y, X, Right Invisible Guys

Left, Right, Left, Right, Y, X, Down Free Throws