Gremlin 11 team
 
 At the title screen, press Left, Right, Square, Circle, Up, Down,
 Square, Circle. If you entered the code correctly, a message will
 appear. 
 
 Invisible players
 
 At the title screen, press Square, Circle, Down, Circle, Up, Right,
 Square, Left. If you entered the code correctly, a message will
 appear. 
 
 Large players
 
 At the title screen, press Up, Down(2), Right, Square, Square,
 Circle(2). If you entered the code correctly, a message will appear.
 
 Small players
 
 At the title screen, press Circle, Down(2), Square, Up(2), Left,
 Right. If you entered the code correctly, a message will appear.
 
 Play with beach ball
 
 At the title screen, press Left, Right, Left, Up, Left, Right,
 Square(2). If you entered the code correctly, a message will appear.
 
 Super furry animal mode
 
 At the title screen, press Left(2), Square, Right(2), Circle, Up,
 Down. If you entered the code correctly, a message will appear.
 
 Ghostball mode
 
 At the title screen, press Square(2), Left(2), Right(2), Circle(2).
 If you entered the code correctly, a message will appear.
 
 Monochrome mode
 
 At the title screen, press Up, Down, Up, Square, Circle, Up, Down,
 Up. If you entered the code correctly, a message will appear.
 
 No floodlights
 
 At the title screen, press Left(3), Circle, Right(3), Square. If you
 entered the code correctly, a message will appear.