Level Skip
Press and hold L1+R1+Circle+Triangle+Diag Up/<+Select+Start. Release all of these buttons when you hear a noise, and press and hold L2+R1+Down+Triangle+X until you hear another noise. Skip the level by pressing the L and R buttons at any time.
(Thanks to seayjh@mindspring.com)

Tempest 2000
Get the high score, and enter H VS as your initials. This new game will appear as an option.
(Thanks to seayjh@mindspring.com)

Tippy Mode
Press and hold L1+R1+Up+<+Triangle+Circle+Start+Select. Then, let go of those buttons and press L2, R1, X, Triangle, and Up.
(Thanks to seayjh@mindspring.com)

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