To get easy extra lives, deliberately get a low percentage kill ratio on a
level where there is an extra life bonus. Anything below 70% kill ratio
will force you back into the battle field to do the level again - with all
the pickups and bonuses in exactly the same places!
Invulnerability - While playing, pause the game and press Up, Left,
Circle, Triangle, Up, Left.
While playing a game press PAUSE and enter the following:
No Damage:
UP, LEFT, CIRCLE, TRIANGLE, UP, LEFT
Skip Level:
DOWN, RIGHT, CIRCLE, TRIANGLE, DOWN, RIGHT
Full Weapons:
RIGHT, DOWN, CIRCLE, TRIANGLE, UP, RIGHT
Gameshark codes
Unlimited energy:
800B7EB4 017F
Unlimited grenades:
801F1BA8 0004
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