Finding Nemo

Credits
Enter: Y, X, B, Y, Y, X, B, Y, X, B, Y, X, X, B, Y, X, B, Y, X, B, B, Y, X, B on the title screen.
(Thanks to gestahlsdream@hotmail.com)

Invincibility
Enter: Y, X, X, B, B, B, Y, Y, X, X, X, B, B, B, B, X, Y, B, B, B, X, B, Y, B, B, X, B, B, Y, B, X, B, B, B, Y on the title screen.
(Thanks to gestahlsdream@hotmail.com)

Level Select
Enter: Y, Y, Y, X, X, B, X, Y, B, X, Y, X, Y, X, Y, B, Y, Y on the title screen.
(Thanks to gestahlsdream@hotmail.com)

Secret Level
Enter: Y, X, B, B, X, Y, Y, X, B, B, X, Y, Y, B, X, Y, X, B, B, X, Y on the title screen.
(Thanks to gestahlsdream@hotmail.com)

Submarine Pipes Puzzle Solution Location
The solution is on the back wall, right behind the door.
(Thanks to gestahlsdream@hotmail.com)

Submarine Slide Puzzle Map Location
The map is in the background when you enter the door to the first Slide Puzzle. It provides the solution, so copy it down to follow it to the end.
(Thanks to gestahlsdream@hotmail.com)