Pitfall: The Mayan Adventure

At the title screen, press L, Select, A, Select, R, A, L, Select. Start a game, hold Select and press B.

Enable the "Master code", then begin game play on any level. Hold Select and press the D-pad during game play to move in any direction.

Quickly and repeatedly press Start at the continue screen until the remaining number of continues increases to nine. Alternately, intentionally lose all your lives during game play in level 1, then press B(3) at the continue screen.