Ecco the Dolphin: Defender of the Future Cheats

Hold L1, L2, R1, and R2, and press X, X, CIRCLE, CIRCLE, X, CIRCLE, UP, DOWN, DOWN: All Vitalits

Hold L1, L2, R1, and R2, and press X, UP, X, DOWN, X, TRIANGLE: Swim With a Group

Ecco the Dolphin: Defender of the Future Master Cheat List
At the title screen hold R1, L2, L1, R2 and press SQUARE, SQUARE, TRIANGLE, CROSS (X), CIRCLE for infinite air.

At title screen hold R1, L2, L1, R2 and press UP, UP, DOWN, DOWN, TRIANGLE, CROSS, CROSS to unlock all stages.