Enter the following codes while playing....
L1, R1, L1, R1, Up, Down, Left, Right
L1, R1, L1, R1, Up, Down, Left, Down
L1, R1, L1, R1, L1, Up, Down, Left, Up
R1, R2, R1, R2, Up, Down, Up, Down
To play as Mr. Phatt:
While fighting Mr. Phatt, finish him off with a combo that does at least 48
points of damage. Once he's unlocked, you can select Mr. Phatt on the
Character Selection screen.
To play as Abaddon:
Complete the entire game in Captain difficulty mode. Once he's unlocked, you
can select Abaddon on the Character Selection screen.
To play as Agent 326:
Beat the Cephalapods (end of game bosses) with a final score
of at least 1,000,000 points.
To play as Overseer:
Beat the game with all of the NON-hidden characters - make sure
to save after you win with each guy.
Game Shark Codes
Infinite Health P1 801df15e0073
Infinite Magnetic Suckers 801df5ce0900
Infinite Neato Torpedoes/ 801df5d00909
Infinite Shaker/ 801df5d20909
Infinite Slow Poke/ 801df5d40909
Play As Abbadon 801d0094000e
Play As Agent 326 801d0094000c
Play As Mr. Phatt 801d0094000d
Play As Overseer 801d0094000f
Thanks to Revolution readers Tim, Brian Prokop, The Mad Tipper, Glen Levitt, Leon Dicks, and Dave Gammon!