Pitfall - The Mayan Adventure - Platform: Gameboy Advance

Cheat mode
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At the title screen, press L, Select, A, Select, 
R, A, L, Select. 

All levels
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At the title screen, press L, Select, A, Select, 
R, A, L, Select. Press Select, R, and L to scroll through 
the levels. Select a level, then press Left to highlight 
the Start-option with the boomerang. 

Lakamul Rain Forest level 
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At the title screen, press A, L, A, R, A, L, Select, Select, 
Start. 

Nine continues 
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Quickly and repeatedly press Start at the continue screen 
until the remaining number of continues increases to nine.