Pitfall: The Lost Expedition

Enter the following button combinations at the title screen:
If the code is accepted, you will see a message.

Unlimited canteen:
Hold L + R and press Left, B, X, Down, B, A, B, X

Unlock Nicole:
Hold L + R and press Left, Up, Down, Up, X, Up, Up

Unlock Retro Harry:
Hold L + R and press Y, Left, Down, B, X, Y, Y, Left

Unlock Original Pitfall mini-game:
Hold L + R and press X, X, Left, Right, X, B, A, Up, X

Lost caverns option: Pitfall 2: Lost Caverns mini-game:
Hold L + R and press Left, Right, Left, Right, Y(3)
or
ind all Idols and purchase all items from the Shamans.

Hyper punch mode:
Hold L + R and press Left, Right, X, Up, X, Right, Left