Ecco the Dolphin Cheat Menu
While playing, press Start to view the radar screen. Press Right, 1, 2, 1, 2, Down, 2, Up to reveal a hidden menu. This menu includes options for invincibility, unlimited continues and more!

Ecco the Dolphin Passwords
Swim to victory with these passwords.

Level                    Password
Medusa Bay               QMBRB
Undercaves               AGCFU
Ridgewater               VADJR
Open Ocean               QYEKR
Cold Water               IAFWN
Deep Water               YAHWV
The City of Forever #1   OKBKI
Origin Beach             CCRIJ
Dark Water               WGUKK
The City of Forever #2   MEMSK
The Tube                 GGWAO
The Machine              KOWMP
The Vortex               WCSKQ