Bronze Mermaidman movie:
Successfully complete Story mode on the Bronze difficulty setting to unlock the Bronze Mermaidman movie under the options menu.
Gold Mermaidman movie:
Successfully complete Story mode on the Gold difficulty setting to unlock the Gold Mermaidman movie under the options menu.
Gold Story Mode:
Successfully complete Silver story mode.
Hook, Line, And Cheddar mini-game:
Enter 893634 as a code to unlock the Hook, Line, And Cheddar mini-game.
Make Your Own Movie option:
Successfully complete Story mode on the Gold difficulty setting to unlock the Make Your Own Movie option under the options menu.
Silver Mermaidman movie:
Successfully complete Story mode on the Silver difficulty setting to unlock the Silver Mermaidman movie under the options menu.
Silver Story Mode:
Successfully complete Bronze story mode.
Silver Story mode challenges:
Enter 486739 as a code to unlock the Silver Story mode challenges.