Here are some cheats and tips for the game Shien’s Revenge.
Thirty continues:
Press Select(7) on controller two at the title screen.
A sound will confirm correct code entry.
Special weapons:
Press Start(7) on controller two at the title screen.
A sound will confirm correct code entry. Nine additional weapons
will be available for selection.
Extra easy difficulty:
Press L(7) on controller two at the title screen. Set
the game to the Dynamic setting.
Extra hard difficulty:
Press R(7) on controller two at the title screen. Set
the game to the Almanic setting
Play as Bosses:
Hold L + R on controller two when starting a
new game. Use controller two to play all Bosses in the game.