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