Begin game play in the "Muddy" level in Original mode. Save the fat man that is under attack that comes into view right after turning a corner. He will give you a +10 credit. Note: This is same the man that says "What is this city coming to?" when the game is played in arcade mode.
Begin game play in the "Muddy" level in Original mode. After you shoot the owl there are two Mickeys that throw knives at you. After you kill them , note the crates that are directly behind them. Shoot the creates to get the diamond that is hidden in one of them.
Start a game in Original mode with 1.2 bullets and play to point the "Muddy" level where zombies climbing the blue van are encountered. After walking up the stairs, a zombie jumps down from atop the buildings. Then, two other zombies that throw knives will appear. There is a door directly behind them. Shoot it until it opens. A man will give you a many different items each time that it is opened.
In the beginning of the Muddy chapter, there is a David on a red car. Shoot the David off and you will see a blue car, Shoot it open. The man will say something and then you will be able to see into the blue car. There will be something in there to shoot.
Choose less civilian paths. When you see the fat man on the boat which is going to be killed by an axed zombie, kill that zombie. After that, quickly shoot Rotten Meats which jump up from the boat.
At the beginning of the level, do not rescue the fat man in the car. After you see Hierophant on the television you will go through the door. Before you turn left, quickly shoot the door in front of you with the shotgun or grenade to get the Credit +10 or Shot Gun item.
At the beginning of the level, do not rescue the fat man in the car. Save the woman in the jail. After you pass two doors, you will enter a room where there are lots of crates and barrels. As you turn left, quickly shoot the chain to make it drop the a weapon or life for you.