Big heads:
Press Down, Right, Up, Left, A, B, Y, X, White, Black, Start + Back at the title 
screen. 

Flat players:
Click Left Analog-stick(2), click Right Analog-stick(2), press L, R, Black, White, B, 
A, Back + Start at the title screen. 

Unlocks:
Argentina Legends team:
Win the American Cup as Argentina. 

Brazil Legends team:
Win the American Cup as Brazil. 

England Legends team:
Win the European Cup as England. 

Holland Legends team:
Win the European Cup as Holland. 

African All-Stars team:
Win the International Cup with an African team. 

American All-Stars team:
Win the International Cup with any American team. 

Asian All-Stars team:
Win the International Cup with any Asian team. 

European All-Stars team:
Win the International Cup with any European team. 

World All-Stars team:
Unlock all the other All-Stars teams, then win International Cup as any team.