Earthworm Jim - Platform: Gameboy Advance

Skip to Buttville Level
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Pause gameplay and press L, A, Up, R, A, R, A, Select. 

Skip to Down the Tubes Level 
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Pause gameplay and press Up, L, DOwn, A, R, A. 

Skip to For Pete's Sake Level 
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Pause gameplay and press R, L, R, L, A, R. 

Skip to Level 5 
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Pause gameplay and press R, L, A, B, B, A, L, R. 

Skip to Snot a Problem Level 
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Pause gameplay and press R, Up, Select, L, R, Left. 

Skip to What the Heck Level 
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Pause gameplay and press Select, R, B, Down, L, B.