Shoot the laser and pause the game while the laser is still visible. Then, press Square, X, Square, Circle, Triangle, Circle, Triangle, Select. Now enter one of the following codes:

Invincibilty

Press Square, X, Triangle.

Super laser

Press Circle(2), X, Circle, Triangle, Square.

Smart bomb

Press Square, X, Circle.

Refuel

Press Circle, X, Square.

Completed current mission

Press Square, X, Square(2), Circle.

Game Shark Codes

Infinite Health	8006B5A8 0168
Infinite Laser	8006EBDC 2C2B
Infinite Missiles	8006E7DC 000F 8006EBE0 000F
Infinite Fuel	8006B550 017B 8006B554 002B

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Five surgeons are discussing who makes the best patients on the
operating table.

The first surgeon says, "I like to see accountants on my operating
table, because when you open them up, everything inside is numbered."

The second responds, "Yeah, but you should try electricians! Everything
inside them is color coded."

The third surgeon says, "No, I really think librarians are the best, everything
inside them is in alphabetical order."

The fourth surgeon chimes in, "You know, I like construction workers, those
guys always understand when you have a few parts left over at the end, and
when the job takes longer than you said it would."

But the fifth surgeon shut them all up when he observed, "You're all wrong.
Politicians are the easiest to operate on. There's no guts, no heart, and no
spine, and the head and ass are interchangeable."