At the title screen, hold down start and A and B. Once you see the level number you want displayed, release the buttons.
Start from the level you lost
When you get a game over screen, return to the title screen,then hold down A and B while pressing select 5 times, then press start.
Successfully complete all levels and save your friends to unlock the Uranoid option at the main menu.
Successfully complete Zone Z' in Quest mode.
Successfully complete Zone W in Quest mode.
Successfully complete Zone V in Quest mode.
Successfully complete Zone V' in Quest mode.
Happy Smiling background music
Successfully complete Eta-5 in Uranoid.
Captain Neo background music
Successfully complete Theta-5 in Uranoid.