During gameplay hold down the START button to bring up the sonar screen. Then press Right, 1, 2, 1, 2, Down, 2, Up. This will allow unlimited continues, invincibility and other options to be turned on or off from a menu that will appear on screen.
Enter the passwords at the password entry screen.
Password Effect OKBKI The City of Forever, part 1 MEMSK The City of Forever, part 2 IAFWN Cold Water WGUKK Dark Water YAHWV Deep Water KOWMP Machine Level QMBRB Medusa Bay QYEKR Open Ocean CCRIJ Origin Beach VADJR Ridgewater GGWAO Tube AGCFU Undercaves WCSKQ Vortex
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