Cheats for PaRappa The Rapper on PS1.
To change Parappa’s voice to the voices of other characters from the game, complete levels 1 and 2 with a ‘Cool’ rating. Then press X, X, X, Triangle, Circle, Triangle, Square, Square, Right, Left, Square, X. Play through and finish the next level, and on the fourth level press X, Square, Triangle, Circle, X. You can now change Parappa’s voice by holding down R1 and pressing Triangle or Circle to go through the selection of voices.