Various cheats
     Run  past  a  boundary,  when the screen starts to get fuzzy. And
before  you die enter this code very fast. If done correct, the screen
will fade to normal. Then after you will have Temporary Invincibility.
This  wont work while on a mission. Temporary meaning heavy explosives
will kill you. Have Fun!

Temporary Invincibility
     [X],  [L1], [A], [Y], [Left], [Right], [B], [A], [X], [L1], [R2],
[Left], [Right], [X], [L2], [L1], [X]

During gameplay press back to go to the map and then arrow button:

God mode
     [Up], [Down], [Up], [Down], [Left], [Left], [Right], [Down], 
[Right]

Infinite ammo
     [Left], [Up], [Down], [Down], [Left], [Right], [Up], [Down], 
[Right]

Max money
     [Right], [Up], [Left], [Left], [Right], [Up], [Down], [Up], [Left]