Original Pitfall Game
At the Title screen press Select A A A A A A Select Start.
Skip to Level 6
At the Title screen press A X A Y A X Select Select Start.
At the Title screen wait until the boomerang circles the word Start then press X Select A Select Y A X Select. Press R and L to select a level.
First enable the Level Select code above and start gameplay. Hold Select and use the DPad to move Harry to any part of the screen.
At the Continue screen keep pressing Start.