Prince of Persia: The Two Thrones cheats and cheat codes for Playstation 2

Restore all sand slots
Hold L3 and quickly press circle, circle, X, square, square, X, 
triangle, triangle during gameplay.

Unlock Hidden Baby Rattle weapon
Finish the game in easy mode. Afer, pause the gameplay and enter 
left, left, right, right, circle, square, square, circle, up, down.

Unlock Hidden Chainsaw weapon
Pause the gameplay, after enter up, down, up, down, left, right, 
left, right, circle, square, circle, square.

Unlock Hidden King Sword weapon
Pause the gameplay, after enter up, down, up, down, left, right, 
left, right, circle, square, circle, square.

Unlock Hidden Swordfish weapon
Finish the game in hard mode. After, pause the gameplay and press 
up, up, down, down, left, right, left, right, circle, square, circle, 
square.

Unlock Hidden Telephone weapon
Finish the game in normal mode. After, pause the gameplay and press 
right, left, right, left, down,down, up,up, circle, square, circle, 
circle, square,square

Unlock Video gallery:
Finish the game. 

Different endings
To fight with the Dark Prince instead of Vizier at the ending:
Get all of the life upgrades.