Here are some cheats and tips for the game Anarchy in the Nippon.
Big Head Mode
After getting the four hidden characters and the last boss,
use these characters to finish the game once each, then a new
option will show up to allow you to play the Big Head Mode.
Hidden Characters
To play as Jacky, Sara, Bun Bun and Jeffry, set the Game Level
to Normal or higher, then use each character to beat the game.
Play as the Boss
To play as the final boss, set the Game Level to Difficult,
Number of Rounds to 2 or higher, then finish the 1P game.