Goldman zombie
Enable the "Infinite credits" bonus. Play through the game and shoot every hostage and try to get the lowest score possible. Towards the end of the game, when the last door is opened, Goldman will appear like a zombie

Muddy: Advance to Magician
Play to the point in the "Muddy" level in original mode where the key is laying next to the dead man. Shoot the key, and get to the point where the boy asks you to save his father. Do not open the lock to proceed through the other door on the opposite side. Shoot the black phone on the couch to advance directly to the Magician

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

Bonus room
Successfully complete the game in original mode without losing any civilians and with a score of at least 1000,000 points to reach a bonus room full of items at the end of the game

Extra $ point credits
For more points added to your score when you complete a level, simply shoot various other items during game play. Shoot lamp post lights, lanterns, stacks of books, jars, tires on boats, windows on cars, chairs, and other furniture. Shooting barrels and drums, however, will not give you extra points, but may reveal items

Muddy: Different pathway civilian
In the beginning of the level, a man is driving a car and has a David on the windshield. Shoot the David off, and you will go up some stairs. Leave the David, and the man will crash into a building. You will then go into the building and continue the level from there

Prelude: Items
Get to the point in the first level in original mode, where the boy runs out the door with the Johnnys chasing him. After that, there are Davids that jump down from the bridge. Use a grenade (only) to blow open the door behind the David to the left. A grandmother will come out and give you a Bullet Blow, Grenade and other items (depending on how many times original mode has been completed).

In the beginning of the game after the women tells you to save the man, there will be a bucket behind him. Shoot the bucket and a Credit +2 will be sitting in the well

Prelude: Different pathway civilian
The first woman civilian you see is being chased by a zombie. Save her, and she will tell you to save the man civilian, who will get attacked by three zombies. If you succeed, he will lead you in a different direction -- not a significantly different pathway, but it cuts through another pathway where a Max zombie will appear. If you take the different path, he will not appear

Rogan costume
Begin game play 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

Bruno costume
Accumulate over 70,000 points and play on the "Sin" level in original mode. You can get the Bruno costume when a maid comes out of a secret room, hands it to you, and wishes you good luck. Note: It is a good idea to have the Double power-up when you are attempting to get the costume

Darkness: Different pathway civilian
During the level, a man will be attacked by an Ebitan on his boat. If you shoot the Ebitan down, the man will reward you by opening the water gate. Let the Ebitan overcome the man, and you will continue on your current course

Despair: Different pathway civilian
During the level, a man will get pulled down by a Kageo. Shoot the Kageo, and you will continue through the level from your current area. Let the Kageo pull him down, and you will go down after him, taking you to a lower level in the area

Darkness: Rotten Meat
In Darkness level in original mode, make sure you fight the Tower in the sand. When you get to the fourth level, save the man that is going be pulled down by a zombie. After you do, you will look back up and in front of you will be a small square metal gate. Shoot it open and inside will be either Rotten Meat item or other items. Rotten Meat makes all of the zombies heads big. so it is easy to get a head shot

Original Sin: Items
Begin game play in the "Sin" level in original mode with over 70,000 points. Start aiming for the lower right corner just before entering the elevator. There is a bullet power-up or a death bullet power-up at that location. The bullets kill any zombie with one hit anywhere on the body.

In original mode, after you go up the elevator and pass the first two doors, kill the zombie that has the laser swords. Just when you are about to turn to the next door, there will be a crate. Shoot it and inside will either be a Custom Air Gun or a Chamber Infinite. Also, directly next to the door will be another crate with an extra life inside