Pitfall: The Lost Expedition cheats and cheat codes for Playstation 2

Unlock Bottomless canteen mode:
Hold L1 + R1 and press Left, Square, Circle, Down, Square, X, Square, Circle 
at the title screen. 

Unlock Nicole:
Hold L + R and press Left, Up, Down, Up, Circle, Up, Up
at the title screen. 

Classic Pitfall mini-game: 
Hold L1 + R1 and press Circle(2), Left, Right, Circle, Square, X, Up, Circle 
at the title screen.  Go to "New Game/Load Game" and play with the mini-game.

Unlock hyper punch:
Hold L1 + R1 and press Left, Right, Circle, Up, Circle, Right, Left 
at the title screen.

Classic Pitfall 2: Lost Caverns mini-game:
Buy all items from the Shamans and collect all Idols.
or
Hold L1 + R1 and press Left, Right, Left, Right, Triangle, Triangle, Triangle.
After you entered you will see a message. Go to "New Game/Load Game" 
and play with the mini-game.