If you want to challenge yourself in this game or are struggling with the current level then this is the cheat for you. To change the difficulty setting go to the 'Title' screen and press Down, Up, Down, Up, Left, Left, Right, Right, R3, R3, L3, L3, X, O. If you have entered the code correctly you will hear a confirmation sound. Then at the level select screen hold R2 and Up and the stage will change that stage's difficulty to 'Hard'. Hold R2 and down instead and the stage difficulty will change to to 'Very Hard'.