At the versus screen, press Square, Triangle, Circle, and X to change the icons in that order on the bottom of the screen. The numbers in the following list indicate the number of times each button is pressed. After the icons have been changed, press the D-pad in any direction to enable the code. If you entered the code correctly, you will see the name of the code and hear a sound. For example, to enter 1-2-3-4, press Square, Triangle(2), Circle(3), X(4). Note: More then one code may be activated per game.