Fighting Force 2

Tons o' Cash E58712CA0000FFFF

At the title screen, press L + R + Y + A + Left (on the analog stick).

At the title screen were it says press start press Left, Up, X, Up, Right, Y There will be a flash then when you start a new game there will be a list of levels.

After you beat the game, go to options and select the new option called Fireworks.