Space Channel 5 [GBA]
Hold L + R and press Up, Left, A, Left, A, Down, Right, B, Right, B during game play. A sound will confirm correct code entry. The game will continue by itself under CPU control.
To unlock extra mode, complete the game once with any percentage then watch the credits. At the end of the staff roll, listen carefully to hear an 'up' pattern when the music ends. If done correctly, you will be able to play in extra mode, which leads you to other rooms in the game. To play extra mode, load the file that reads [Extra Mode] in the name archive, then select 'Continue'.