Doom - Platform: Gameboy Advance

God mode:
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Pause the game, then hold L + R and press A, A, B, A, A, A, A, A. 

Computer map:
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Pause the game, then hold L + R and press B, A, A, A, A, A, A, A. 

Radiation suit:
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Pause the game, then hold L + R and press B, B, A, A, A, A, A, A. 

Advance to anonter level:
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Pause the game, then hold L + R and press A, B, A, A, B, B, A, A. 
You will advance about 5 levels, depending on where you are. 

Tower Of Babel level:
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Pause the game, then hold L + R and press A, B, A, B, A, B, B, A. 

All weapons, items and keys:
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Pause the game, then hold L + R and press A, B, B, A, A, A, A, A. 

Invincibility:
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Pause the game, then hold L + R and press B, B, B, A, A, A, A, A. 

Berserk mode:
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Pause the game, then hold L + R and press B, A, B, A, A, A, A, A.