If you have a USB keyboard, you can use these extra "cheats" on top of the "normal cheats".

• L - Toggle Debug Menu on/off
• K - Toggle Damage Taken on/off
• \ - Display Settings on/off
• Y - Invert Aiming on/off
• X - Freeze Action on/off

On the main menu, press SQUARE, SQUARE, CIRCLE, CIRCLE, L1, L1, R1, R1, L2, L2, R2, R2. Start the game and confirm correct entry by viewing the in-game options (while playing) and see if you have some new options to adjust the difficulty of the game.