At the main menu, press Left(2), Right(3), Left, Right, Start on a standard controller or light gun D-pad. If you entered the code correctly, a "0" score will appear at the top left portion of the screen.

Successfully complete original mode to unlock a blood color option.

Successfully complete original mode. Then the Goldman costume will appear in the trunk of the car in the next original mode game.

Begin a game in original mode and select the 2.0 Bullets and the Double Score items from the trunk. Rescue all civilians except for the second person on level 4. Complete the game and enter the bonus room at the end. A Rogan Costume and an Infinite Credits item will be in the room.

Successfully complete training mode with a five red star rating on each stage. Then, infinite super ammunition that kills with one hit will be unlocked.

Successfully complete training mode with all five red stars. Then, successfully complete boss mode with all five red stars. Finally, get two stars in fight all mode. Then the "Continue" option will change to "Free Play". Note: For the Japanese version of the game, successfully complete training and boss modes.

Successfully defeat and obtain a ranking for all bosses in boss mode to unlock "Emperor" and "Fight All Bosses" options.

Use a controller in port B to play as Gary instead of James in single player mode.

Successfully complete training mode on all five difficulty settings to receive all items in original mode.

Successfully complete the game without any hostages being killed.