Press select go to sfx and press 000 Square square
select 0 select. to grow three times your height
Hold [F10] while entering one of the following cheat codes.
Then, hold [F10] and press [F5] to activate the corresponding cheat function as many times as needed. To enter another code, hold [F10] and press [F6] to disable the current code. Then, hold [F10] and enter the next code.
Refill Shield Gauge:
Hold F10 while you enter this sequence -
F2, F1, F4, F3, F5.
Easter Egg Weapons:
Enter these codes on the password screen.
DYPYFASRHR - All missions completed, all easter egg weapons.
SYMRGOBRRL - No missions completed, all easter egg weapons.
DYSIFASRHY - All missions completed and locked, all easter egg weapons.