Change difficulty
     At the title screen, enter Down, Up, Down, Up, Left, Left, Right,
Right,  R3,  R3, L3, L3, X, O. After that you will hear a confirmation
sound.  During  the level select screen, hold R2 and up and select the
stage  will  change  that stage's difficulty to Hard. Hold R2 and down
instead will change the difficulty to Very Hard.