Frogger 2 - Swampy's Revenge - Platform: Dreamcast

Level select 
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Pause the game, then hold X and press 
Up, Down, Left, Right(3), Down, Left.

Level skip 
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Pause the game, then hold X and press 
Right, Left, Up(3), Right, Left(2).

Infinite lives 
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Pause the game, then hold X and press 
Down(2), Up, Down, Right, Down, Up(2).

All extras and bonus levels 
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Pause the game, then hold X and press 
Right, Up(2), Down, Right, Down, Right.

All characters 
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Pause the game, then hold X and press 
Left, Right, Left(3), Up, Left(2).

Temporary invincibility 
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Pause the game, then hold X and press 
Left(2), Up, Left, Down, Right(3).

Turn coins into Mad Garibs 
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Pause the game, then hold X and press 
Right, Left, Right, Left, Up(2), Left, Right.