Enable All Levels At Main Nenu, keep "New Game" highlighted. Then press Triangle, Square, Circle, Triangle, Square, Up, Up, Up. You will hear a sound if done correctly. (Thanks to xenaswolf@home.com)

Full Shield and Attack At Main Menu, keep "New Game" highlighted. Then press Triangle, Square, Triangle, Square, Square, Up, Up, Up. You will hear a sound if done correctly. (Thanks to xenaswolf@home.com)

Invincible Xena At Main Menu, keep "New Game" highlighted. Then press Up, Up, Up, Circle, Square, Up, Right, Left. You will hear sound effect if you have put codes in correctly. (Thanks to xenaswolf@home.com)