You need all three save files empty to pull of this unique cheat. To clear all saved games, press LEFT, LEFT, RIGHT, LEFT, R, R on the copyright screen. Name the three save files as follows:

#1 - BEST
#2 - GAME
#3 - EVER

Use file #1 for the cheats. Once the cheat is activated, files #2 and #3 can be erased for these other cheats:

EDACRA - Unlocks Arcade Level
G6155 - Unlocks all alternate vehicles
SUPERSPY - Invincible and infinite ammo

Clear all primary objectives on Super Agent.

Clear all primary and secondary objectives on Super Agent.

Get a fresh start, press UP, UP, DOWN, L, R, L on the copyright screen.

Start a game on Special Agent and pause it. Press LEFT, LEFT, RIGHT, RIGHT, RIGHT, LEFT, LEFT, A.