Unknown Cheat - Pirates of the Caribbean: Dead Man's Chest (U) (GBA)

Pirates of the Caribbean: Dead Man's Chest

With this game, Select and Down are interchangeable for codes.
Pause game play, then press Select to display the "Enter Cheat Code" prompt.

Here is a new code, with a currently unknown effect:
Up, Down, Down, Down, Down, Up

Just like the 'Restore Health' code, it does not play a sound effect upon inputting the code correctly.

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For completeness, here are the rest of the push-button codes.

Invincibility
R, L, Up, Up, Left, Right

Keep your ship sailing as fast as possible (Magic Wind)
Up, R, Down, Left, Left, Right

Restore health
Down, R, A, L, Left, Right

Exit map to island navigation
Left, A, Left, Down, Down, Down

Unlock Rumors
A, L, Down, A, Right, Up

All ship upgrades
Right, Left, Left, Down, Up, Down

Jack Sparrow fully upgraded
Right, L, Down, A, Left, Down

1,000 gold
A, L, Down, R, Right, Right

Restore grog/food
A, Down, Left, Down, Right, Up