Here are some cheats and tips for the game Fighter’s History.
Fight as Bosses:
Quickly press Right(2), Up(2), L, R,
Start after the title screen appears. A chime will confirm
correct code entry. The Bosses faces will appear in the middle
of the standard fighters on the character selection screen. For
a two-player game, press Select, Start instead of
Start in the last part of the code.