Ecco the Dolphin - Defender of the Future - Platform: Playstation 1

Level select:
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Hold L1 + L2 + R1 + R2 and press Up(2), Down(2), 
Triangle, X(2) at the title screen.

Unlimited air:
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Hold L1 + L2 + R1 + R2 and press Square(2), Triangle, 
X, Circle at the title screen.

Unlimited health:
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Hold L1 + L2 + R1 + R2 and press Triangle, X(2), Up(2), 
Down at the title screen.

All Vitalits:
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Hold L1 + L2 + R1 + R2 and press X(2), Circle(2), X, 
Circle, Up, Down(2) at the title screen.

Swim with a group:
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Hold L1 + L2 + R1 + R2 and press X, Up, X, Down, X, 
Triangle at the title screen.

Dolphin Soccer:
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Go to the Powers Of Levitation level and find your way 
to the room where the clan General (the dolphin that 
has the inspection) is located. Swim through the side 
of the wall that moves like Jello. On the floor near 
one of the orange lights is a soccer ball. Get it, 
then go to the level selection screen. An option for 
the Dolphin Soccer mini-game will appear at the bottom 
of the list.

Bonus levels:
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Successfully complete the game under the hard difficulty 
setting. The Up & Down level will shimmer, and you can 
now access both 2D bonus levels.