- SECRET PASSWORDS:
| SWEET TOOTH | LEFT LEFT LEFT RIGHT RIGHT |
| MINION | RIGHT RIGHT RIGHT LEFT LEFT |
| DEMO LEVEL | UP UP UP LEFT LEFT (DEATHMATCH ONLY) |
| WAREHOUSE LEVEL | SQU SQU SQU LEFT LEFT (DEATHMATCH ONLY) |
| DISCO LEVEL | LEFT LEFT LEFT SQU SQU (DEATHMATCH ONLY) |
| GOD MODE | L1 SQU X R1 START |
| ICY GOUND | UP UP X X UP |
| ALONE IN DEATHMATCH | X O O O O |
| SUPER HARD CPU | L1 R1 L1 R1 R1 |
| CPU DONT GET HEALTH | DOWN L1 DOWN START TRI |
| 99 FREEZE MISSILES | TRI UP O RIGHT START |
| HUGE RICOCHETS | LEFT RIGHT LEFT RIGHT UP |
| SUPER NAPALM | R1 R1 L1 L1 L1 |
| HOMING RAIN MISSILES | UP DOWN UP DOWN UP |
| INFINITE WEAPONS | TRI O UP RIGHT DOWN |
| INFINITE SPECIALS | L1 L1 R1 R1 R1 (GET KILLED THEN REVIVE) |
| EXTRA FAST WEAPONS | R1 R1 L1 L1 L1 |
| EXTRA SEEKING WEAPONS | TRI LEFT DOWN RIGHT UP |
| EXTRA DAMAGE WEAPONS | TRI O DOWN LEFT UP |
| ONLY HOMING MISSILES | START R1 L1 START START |
| ONLY POWER MISSILES | START L1 START L1 START |
| ONLY NAPALM | START START L1 L1 L1 |
| ONLY REMOTE MISSILES | L1 R1 START START L1 |
| NO HEATLH PICKUPS | SELECT L1 SELECT START O |
| NO HEALTH REGAIN | L1 START START START R1 |
| SEXY FLOWER POWER PIC | LEFT SQU SQU SQU LEFT (GO TO FP INFO) |
| SAVE SETTINGS | START START START START START |
- PLAY AS DARK SIDE & PRIMEVAL: (GAMESHARK)
ENTER ONE OF THESE CODES "DARK SIDE = 800D28D0 000E" OR "PRIMEVAL = 800D28D0 000F" THEN AFTER YOU CHOOSE TO START GAME WITH ENHANCEMENTS, TURN THE GAMESHARK OFF. NOW AT SETTINGS TURN IN-GAME MENU ON. NOW START A NEW GAME THEN QUIT. AT THE IN-GAME MENU, TURN THE GAMESHARK BACK ON AND START THE GAME.
NOTE: THIS CODE REQUIRES AN OLD PS1 WITH THE HOOK-UPS IN THE BACK FOR THE OLD STYLE GAMESHARK WITH AN ON/OFF SWITCH.