Pitfall: The Mayan Adventure Cheats - GBA

Master code
Press [L], [Select], [A], [Select], [R], [A], [L], [Select] at the title screen to enable cheat mode.

Level select
Enable the "Master code", then press [L] or [R] to select a level. Press [Left] to highlight "Start" to begin game play at the selected level.

All weapons
Enable the "Master code", then begin game play on any level. Hold [Select] and press [B] during game play to get 99 of each weapon.

Free movement
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.

Lakamul Rain Forest level
Press [A], [L], [A], [R], [A], [L], [Select]x2, [Start] at the title screen.

Nine continues
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]x3 at the continue screen.

Lost City Of Copan: Extra life
In level 5 (Lost City Of Copan), find the location where there are two spider webs. Jump on the first and use the D-Pad to land on the second one. Keep doing this until a golden figure appears in between the two. Jump out to get it and you will receive an extra life.