Karaoke Revolution: Volume 2
At the "Press Start" screen, press Square, Triangle, Down, Left, Up, Right, L2, R2, Start. Note: You cannot save the game when this code is enabled.
At the "Press Start" screen, press Square, Triangle, Right, Up, Left, Down, R2, L2, Start.
At the "Press Start" screen, press Up, Square, Right, Circle, Square, Left, Circle, Up, L3, R3.
At the "Press Start" screen, press Up, Circle, Left, Square(2), Down, Circle, Right, R3, L3.
At the "Cheat" screen or while playing the game, press L1(2), R2(2), Right, Down, Circle, Left, Up, Square.
At the "Cheat" screen or while playing the game, press Circle, R2, Square, L1, R1, L2, Square, Up, Circle, Square.
At the "Cheat" screen or while playing the game, press R1, L1, R2, L2, Right, Left, Down, Up, Circle, Square.
At the "Press Start" screen, press R3, Circle, Square, R3, Down, Right, Left, Up, Square, Circle.
At the "Press Start" screen, press Down, R3, Right, L3, R3, Down, L3, Left, Circle, Up.
At the "Press Start" screen, press Up(2), L3, Down, Left, Right, R3, Right, Circle, Square.
At the "Press Start" screen, press Down, R3, Up, R3, L3, Down, L3, Up, Down, Square.
At the "Press Start" screen, press Up, R3, Right, R3(2), Left, R3, Down, Circle(2).
At the "Press Start" screen, press Down, L3(2), R3(2), Circle, Right, Square, L3, R3.
At the "Press Start" screen, press Down, R3, Circle, L3, R3, Down, L3, Square, Circle, Square.
At the "Press Start" screen, press Right, Left, R3, Left, Up(2), L3, Down, Circle, Square.
At the "Press Start" screen, press L3, Circle, Up, Circle, Square, L3, Down(2), R3.
At the "Press Start" screen, press Up, R3, Right, L3(2), Up, Left, Up, Square, Circle.
At the "Press Start" screen, press Right, R3, Right, R3, Square, Right, Circle, Square, Down, Left.
At the "Press Start" screen, press Down, L3, Up(2), Left, Right, Down, R3, Circle, Square.
At the "Press Start" screen, press Up, R3, Up, Down, Right(2), Left, L3, Circle, Square.
At the "Press Start" screen, press Left, Right, Left, L3, R3, Down, Up, Up, Circle, Square.
At the "Press Start" screen, press R3, Square(2), Down, Circle, L3, Square(2), Up, Left.
At the "Cheat" screen or while playing the game, press Down(3), Up, R1, L2, R2, L1, Circle(2).
At the "Cheat" screen or while playing the game, press Right(2), Up(2), L2(2), R2, R1, L1.
At the "Cheat" screen or while playing the game, press Square(4), Circle, Down(2), R2, L2, R1.
At the "Cheat" screen or while playing the game, press Square(2), Circle, R2(2), L2, Down, Right(2), Up.
At the "Cheat" screen or while playing the game, press Circle, L1, R2, Up(2), Left(2), Square(2), R1.
At the "Cheat" screen or while playing the game, press L2, R2, L2, R2, Square, Down, Circle, Up, Left, Right.
At the "Cheat" screen or while playing the game, press R2, Left, R1, Right, Up(2), Square, Circle, Down, L2.
At the "Cheat" screen, press Right, Up, Circle(3), R2, R1(2), L2, Down.
At the "Cheat" screen, press Square(2), Left(2), R2, L1, R2, R1, Circle, L2.
At the "Cheat" screen, press Circle(2), Right(2), R2, R1(2), R2, Circle, R2.
At the "Cheat" screen, press Left, L1, L2, Square(2), L2(2), L1, Left(2).
At the "Cheat" screen, press Up, Down, Left, Right, L1, R1, Square, Circle, R2(2).
Successfully complete all songs in Showtime mode to unlock cheat options such as Small Head Character, Big Eye Character, Banana Microphone, Toothbrush Microphone, and Dwayne Doll Microphone.
Successfully complete all songs in Showtime mode with all "Gold" ranks to unlock cheat options such as Big Head Character, Glass Character, Oil Slick Character, Mercury Character, Wraith Character.
Successfully complete all songs in Showtime mode with all "Platinum" ranks to unlock cheat options such as Tough Crowd, Pirate Crowd, Robot Crowd, Zombie Crowd.
Successfully complete Showtime mode to unlock bonuses that include The Dude, Helga, Sorrow, Vox, and Joe as playable characters; multiple alternate costumes for Ishani and Dwayne; The Garage, The Wagon Wheel, and HMX Records locations; Rich Girl, I've Got You Under My Skin, and Virtual Insanity songs, and the Wavegroup Sings, Harmonix Sings, Playtesters Sings, and Konami Sings FMV sequences.
You can trick the game by humming, rather than singing, at the correct pitch.