UEFA Dream Soccer Unlock stadiums 1, 2, 5, and 11
At the arcade mode menu, press B, Up, Y, Left, A, Right, Down.
Unlock stadiums 3, 7, 10, and 15
At the arcade mode menu, press B, A, Left(2), Start, B, A, Left(2), Start.
Unlock stadiums 8, 13, and 16
At the arcade mode menu, press B, A, Right, Start, B, A, Right, Start.
All-Star teams
At the arcade mode menu, press Start, A, Y, Up, Right, B, A, Down.
Silicon Dream teams
At the arcade mode menu, press Y, A, B(2), A, Down, A, B(2), A, Down, Up.
Small players
At the arcade mode menu, press Down, Up, Left(2), A, Right, Down, Start.