When you reach the rank of 'Underboss' you don't have to worry about cops when you steal parked car.

At the 'Join the Family' menu where you view the 'File Archives' press circle, square, circle, square, square, L3 to unlock ALL the movies. The cheat will take effect immediately if you've entered the code in correctly.

Get 91.5 game completion by taking over every business and racket and putting out contracts on the other families most notorious gangsters so you become the Don of New York you will get infinite ammo and $1 million Dollars.

To enable this sneaky trick that will bypass the 5 minute lockout before it can be entered again you have to pause gameplay and press Circle, Left, Circle, Right, Square, R3. When you have entered the code save the game and quit and then reload your saved game.

Below is a list of some of the guns that can be used in the game and how to get them.

Unlock Python:
Buy 3rd Magnum upgrade

Unlock Street Sweeper:
Buy 3rd upgrade for Shotgun

Unlock Dillinger:
Buy 3rd upgrade for Tommy Gun

Unlock Saturday Night Special:
Buy 3rd .38 Snub Nose upgrade

Unlock Assassin's Pistol:
Buy 3rd Pistol upgrade

Infinite Money and Respect:
Do this sneaky little trick to get infinite money and respect. All you've got to do when you have completed the first mission is save the game and quit the game before answering the phone. When you now reload your saved game file you'll get $500 and 500 Respect Points from the previous mission. Quit and reload the saved game file as many times as you want to get $500 and 500 Respect points every time.

Infinite Money:
This isn't the quickest way of getting money but it does work. When you enter a nightclub, shop, hotel etc that you are the owner of go to the room that the cash register is located and take the money and leave the room. When you now re-enter the room the cash machine will miraculously be repaired. Repeat the process of smashing the cash register and leaving the room before re-entering to get as much money as you want.

During game play pause the game to enter the following codes, these codes can only be entered once every 5 minutes.

Unlock Full Ammo:
Circle, Left, Circle, Right, Square, R3

Unlock Full Health:
Left, Square, Right, Circle, Right, L3

Unlock $5,000:
Square, Circle, Square, Square, Circle, L3

Complete the following tasks to unlock the corresponding clip

Unlock Johnny Fontane Clip:
Collect 10 Film Reels.

Unlock Don Sends Luca On An Errand Clip:
Collect 20 Film Reels.

Unlock Luca's Demise:
Clip Collect 30 Film Reels.

Unlock The Don Is Dead Clip:
Collect 40 Film Reels

Unlock Whack Paulie Clip:
Collect 55 Film Reels

Unlock Good Morning Mr. Woltz Clip:
Collect 70 Film Reels.

Unlock Sonny At The Tollbooth Clip:
Collect 85 Film Reels

Unlock Are You Ready To Do Me This Favor? Clip:
Complete 'Change Of Plans' mission.

Unlock Carlo Goes For A Ride Clip:
Complete 'It's Only Business' mission.

Unlock Carlo Learns A Lesson Clip:
Complete 'Sonny's War' mission.

Unlock Five Shots Clip:
Complete 'The Don is Dead' mission.

Unlock Mattresses Montage Clip:
Complete 'A Recipe for Revenge' mission.

Unlock Meeting With Sollozzo Clip:
Complete 'A Grave Situation' mission

Unlock Mr. Bonasera Clip:
Complete 'The Enforcer' mission

Unlock Mr. Woltz Clip:
Complete 'Death To The Traitor' mission.

Unlock Regarding Sollozzo Clip:
Complete 'The Alley' mission.

Unlock Sicilian Sign Clip:
Complete 'Sleeping With The Fishes' mission

Unlock Sonny And Tom Argue Again Clip:
Complete 'Fireworks' mission

Unlock Sonny And Tom Disagree Clip:
Complete 'Intensive Care' mission

Unlock Sorry Sally Clip:
Collect 100 Film Reels

Unlock Spoiled Guinea Brat Clip:
Complete 'The Silent Witness' mission

Unock The Baptism Clip:
Complete 'Baptism By Fire' mission

Unlock The Don's Demise Clip:
Complete 'Order To Kill' mission

Unlock Trigger Too Tight Clip:
Complete 'Horseplay' mission

Unlock Where's Michael? Clip:
Complete 'Now It's Personal' mission