Change Parappa's voice
 
 Complete the first two levels with a "Cool" rating. Then, press X(3),
 Triangle, Circle, Triangle, Square(2), Right, Left, Square, X and
 finish the next level as usual. On the level 4, press X, Square,
 Triangle, Circle, X to allow Parappa's voice to be changed. Hold R1
 and press Circle or Triangle to cycle through the voices of the other
 characters in the game. 
 
 Play as a Beetle
 
 To play as the beetle that you face on the last stage, beat the first
 board on Cool!, The second board on Good! The third board on Good!
 The Fourth board on Cool! The Fifth board on Cool! Finally beat the
 last stage on Good!, But the Cool! Word has to be blinking. If you do
 all of these directions, there should be a new game that you can
 choose called, the Beetle Rappa! 
 
 Bonus level
 
 Complete each level with a "Cool" rating. A bonus level with Sunny
 Funny and Katy Kat dancing on a table will be accessible.
 
  Game Shark Codez:
 
                 
  Always Score 999 Points      
  801C3670 03E7
                 
  Rappin Modifier              
  801C368E 000?
                 
  Quantity Digits to Accompany 
  Rappin Modifier Code         
                 
  00 - Cool                    
  01 - Good                    
  02 - Bad                     
  03 - Awful