Kao the Kangaroo - Platform: Dreamcast

Level skip: 
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Enter the map screen while playing a game, 
then hold L + R and press Up(2), Left, Down, X. 

Level select: 
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Enter the map screen while playing a game, 
then hold L + R and press Up, Down, Right, 
Left, Up, X. 

Infinite lives: 
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Enter the map screen while playing a game, 
then hold L + R and press Down, Left, B, 
Left, B(2). 

Infinite health: 
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Enter the map screen while playing a game, 
then hold L + R and press Down, B(2), A, Up, 
Left, Right. 

Infinite checkpoints: 
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Enter the map screen while playing a game, 
then hold L + R and press Up, Right, Down, 
Right, Left, A. 

Infinite gloves:
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Enter the map screen while playing a game, 
then hold L + R and press Down, Right, Up, 
Right, Left, B. 

Extra life: 
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Enter the map screen while playing a game, 
then hold L + R and press Down, A, Up, Left, A. 

Extra checkpoint: 
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Enter the map screen while playing a game, 
then hold L + R and press Up, Right, Down, 
Left, A. 

Extra glove: 
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Enter the map screen while playing a game, 
then hold L + R and press Down, Right, Left, 
Down, A.