Gex: Enter The Gecko Codes -

Reaching the Titanic level:
Go to the first main room and approach the arch. Climb the wall to reach the roof of the arch. Once on top, look for a floating square and jump on to ride to the Titanic TV screen.

Super password:
Enter M758FQRW3J58FQRW4! as a password for all remotes with 99 lives. Alternatively, enter NJ4N[Solid Right Arrow]P2S274N[Solid Right Arrow]P2S28 for all remotes with 127 lives (only 99 will be displayed on screen).

Glitch: Get under the Titanic:
Get under one of the metal doors in the Titanic level when it is coming down to get under the Titanic.