Karaoke Revolution Vol.3 - Platform: Playstation 1

Bonus songs:
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Successfully complete Showtime mode to unlock China Grove and In The Midnight Hour. 
Get a 'Platinum' rank in at least one song in each venue to unlock Snake Eater 
(from Metal Gear Solid 3). Get a 'Gold' rank or greater in at least one song in 
each venue to unlock Waiting For You (from the Silent Hill 4 soundtrack).

Cheat Collection 1:
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Complete at least one song with a 'platinum' rank in each venue in Showtime mode to 
unlock the 'Cheat Collection 1' option. Then, select the 'Cheats' option at the 
'Extras Menu', select 'Cheat Collection 1', then enter one of the following codes 
to unlock the corresponding cheat option. A sound will confirm correct code entry.

Big Eyed Character Press Circle(2), Square(2), Down, Left, Left, Down.
Banana microphone: Press Down, Up, Left, Right, Square, Circle, Square, Circle.
Toothbrush microphone: Press L2(2), Square, Circle, Down, Up, Left, L3.
Dwanye doll microphone: Press Square(2), R3, Circle, Up, Down, Right, Left.

Cheat Collection 2:
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Complete all songs without a 'Gold' or 'Platinum' rank in each venue in Showtime mode 
to unlock the 'Cheat Collection 2' option. Then, select the 'Cheats' option at the 
'Extras Menu', select 'Cheat Collection 2', then enter one of the following codes to 
unlock the corresponding cheat option. A sound will confirm correct code entry.

Big head character: Press Circle, Square, Circle, Square, Up, Right, Down, Left.
Mercury character: Press Down, Down, Right, Left, Right, Left, Square, Circle.
Wraith character: Press L2(2), Right(2), Circle, Square, R1, R1.
Fish microphone: Press Square, Down, Up, Left, Square(2), L2, L1.

Cheat Collection 3:
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Complete all songs with a 'Gold' rank in each venue in Showtime mode to unlock the 
'Cheat Collection 3' option. Then, select the 'Cheats' option at the 'Extras Menu', 
select 'Cheat Collection 3', then enter one of the following codes to unlock the 
corresponding cheat option. A sound will confirm correct code entry.

Small head character: Press Circle, R2, L2, R1, L1, Down(2), Up.
Glass character: Press Down, L2, R1, R2, L1, Circle, Square, Circle.
Oil slick character: Press L3(2), R2, R1, L2, L1, Down, Up.
Ice cream microphone: Press Square, Circle, Square, Circle, R2, L2, R1, L1.

Cheat Collection 4:
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Complete all songs with a 'Platinum' rank in each venue in Showtime mode to unlock 
the 'Cheat Collection 4' option. Then, select the 'Cheats' option at the 'Extras Menu', 
select 'Cheat Collection 4', then enter one of the following codes to unlock the 
corresponding cheat option. A sound will confirm correct code entry.

Tough Audio Crowd: Press Circle, L1, L2, R1, R2, Right, Right, Down.
Pirate Crowd: Press Down, L2(2), R2(2), Square, Circle, Square.
Robot Crowd: Press L3, Down(2), R1, Circle, Square, Circle, Square.
Zombie Crowd: Press Square(2), Circle(2), Up, Right(2), Up.
Alien Crowd: Press Up(2), Down, Circle(2), L2, R2, Square.

Music Video venue:
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Get a 'Platinum' rank on a song to unlock the Music Video venue in Karaoke, 
Medley, and Quickplay modes.

Easier songs:
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You can fake the game by humming, rather than singing, at the correct pitch.