Alternate Main Characters
     At  the  Title  screen,  press  Right, Left, Right, Down, Up, Up.
Then,  change  the number that appears on the upper left corner of the
screen to play as different characters.

Change Window Color
     Wait until the message window appears while playing a game. Then,
hold  Select  +  Triangle  + L1, L2, R1 or R2. While those buttons are
held,  press  Up  or  Down to change the corresponding color value. L1
controls red, L2 controls green, R1 controls blue, and R2 controls all
three values.