Bonus Characters:

Go to Mayhem mode and highlight Set Teams. Press and release Circle + Square. Now press Select (4x), Start (3x), Square(2x), Circle, Circle + Square.

Bonus maps:

Go to Mayhem mode and highlight Accept Teams. Press and release Circle + Square. Now press Select (4x), Start (3x), Square(2x), Circle, Circle + Square.

Map select:

Go to Strategy mode and highlight Set War. Press and release Circle + Square. Now press Select (4x), Start (3x), Square(2x), Circle, Circle + Square.