Cheat Codes:

BORNFREE = Level Select
ALMABHOL = Open all levels
HARDBODY = Invincibility
VITAMINS = Gain 31 lives
CORONARY = Plenty of hearts to keep you health
EVILDEAD = Immortal enemies
TWISTEYE = Rotate the screen by holding L1 + L2 and moving the D-pad
INANDOUT = Quitting returns you to the map
THETHING = Hold L2 to mutate your body. Press L2 + X to reset
BODYSWAP = Press Triangle to swap characters in mid-game
OTTOFIRE = Special weapons never run out of power
TOMMYBOY = Takes you to a pinball screen when you finish a level
CASHDASH = Takes you to a "speed greed" screen when you finish a level
KNCACKDE = Bonus pinball round 

Passwords:

01 -- ADEAMIIE
02 -- EPIJAKCA
03 -- FBIJAKCI
04 -- KOCCCIEE
05 -- NGIAIBJJ
06 -- NIIAJBCB
07 -- KGCACICI
08 -- AHICBAJE
09 -- AIICFAJG
10 -- AIICBAJI
11 -- FBIIAKCK
12 -- FDIIAKDC
13 -- FFIIAKDK
14 -- KACACIBA
15 -- ADMCFAID
16 -- EMIIEKBE
17 -- OEIBIBMJ
18 -- FAAIAKCE
19 -- TTFACCKT