- INVINCIBLE:
DURING THE GAME, HOLD RIGHT, PRESS SQU, O 3 TIMES, SQU, O, TRI, X.
- UPGRADE WEAPON:
DURING THE GAME, HOLD RIGHT, PRESS SQU, SQU, TRI, TRI, O 3 TIMES, X.
- LEVEL SELECT:
DURING THE GAME, HOLD RIGHT, PRESS O, O, SQU, TRI, TRI, SQU, O, X.
- SKELETON ZEKE:
AFTER TURNING ON THE GAME AND BEFORE LEGAL INFO SCREEN APPEARS, HOLD X+SQU+TRI+O UNTIL TITLE SCREEN APPEARS. NOW START THE GAME.
- INVISIBLE ZEKE:
AFTER TURNING ON THE GAME AND BEFORE LEGAL INFO SCREEN APPEARS, HOLD X+SQU+L1+R1 UNTIL TITLE SCREEN APPEARS. NOW START THE GAME.
