Pirates of the Caribbean: At World's End Codes -

Block all attacks
At the start menu press , , , , , and you'll block all the attacks.

Invincibility
At the menu screen hold + and press , , , , , .

Isla Cruces level: Gold Idol location
When you get to the waterfall where enemies attack you, defeat them all. Then, walk into the waterfall. Behind the waterfall is a secret room with the gold idol.

Unlock Swords
The following swords are listed by order of strength. Complete the indicated task to unlock the corresponding sword:

Cutlass - Default sword.
Dutchman sword - Complete the Pearl Vs Dutchman level.
Norrington sword - Complete the Isla Cruces level.
Bone sword - Complete the Davy Jones' Locker level.
Gun sword - Complete the Sea Battle level.
Pirate King's sword - Complete the Shipwreck City level.
Davy Jones' sword - Complete the Maelstrom level.
Ghost sword - Complete the Hit Combo sub-mission on the Isla Cruces level.
Legend sword - Complete the Hit Combo sub-mission on the Maelstrom level.