Cheats:
Activate the following cheats by pausing the game and entering the corresponding sequences of buttons. Each cheat can only be entered once every 5 minutes:
$5,000 – Minus, 2, Minus, Minus, 2, Up
Full health – Left, Minus, Right, 2, Right, Up.
Full ammunition – 2, Left, 2, Right, Minus, Down.
All movies:
To unlock all movies, at the main menu, press 2, Minus, 2, Minus, Minus, Up.
Movies:
Unlock the following movies by beating the corresponding mission or collecting the corresponding amounts of film reels:
Regarding Sollozzo – “The Alley” mission
Mr. Bonasera – “The Enforcer” mission
Meeting With Sollozzo – “A Grave Situation” mission
Sicilian Sign – “Sleeping With The Fishes” mission
Five Shots – “The Don Is Dead” mission
Sonny And Tom Disagree – “Intensive Care” mission
Sonny And Tom Argue Again – “Fireworks” mission
Mr. Woltz – “Death To The Traitor ” mission
Trigger Too Tight – “Horseplay” mission
Mattresses Montage – “A Recipe For Revenge” mission
Where’s Michael? – “Now it’s Personal” mission
Spoiled Guinea Brat – “The Silent Witness” mission
Carlo Learns A Lesson – “Sonny’s War” mission
Are You Ready To Do Me This Favor? – “Change Of Plans” mission
The Don’s Demise – “Order To Kill” mission
Carlo Goes For A Ride – “It’s Only Business” mission
The Baptism – “Baptism By Fire” mission
Johnny Fontane – Collect 10 film reels
Don Sends Luca On An Errand – Collect 20 film reels
Luca’s Demise – Collect 30 film reels
The Don Is Dead – Collect 40 film reels
Whack Paulie – Collect 55 film reels
Good Morning Mr. Woltz – Collect 70 film reels
Sonny At The Tollbooth – Collect 85 film reels
Sorry Sally – Collect 100 film reels
Unlimited money:
To quickly get money, smash the cash register of a business that you own and take the money. Walk outside and then back in, and repeat the process.
Dillinger:
To unlock the Dillinger, buy the third upgrade for the Tommy Gun.
Street Sweeper:
To unlock the Street Sweeper, buy the third upgrade for the Shotgun.
$1 million:
To get $1 million, reach the “Don Of New York City” rank at 91.5% game completion.
Stealing cars without heat:
To have no heat when stealing a parked car, reach the “Underboss” rank.
Removing wanted stars:
To remove wanted starts and lose the police, just move to a different area.
Avoid getting shot:
When you are getting shot at, grab someone nearby and use them as shield.
Luring enemies:
On missions where you must kill your enemy in a certain way such as throwing them off of a roof, first lure them over to it by avoiding them and they will come to you. Then beat them up a little bit, grab them, and swing them so they have their back to the hazard. Move forward to shove them.
Ammo at safe houses:
The orange safe houses on the map have ammo. They are usually in hotels.
“The Don Is Dead” mission tip:
In the barber shop, break the windows in before starting the mission. Once the Don is shot you will be able to easily shoot through the window.
Marlon Brando’s last appearance:
Marlon Brando makes his last appearance in the game at the mission where you protect the Don at the hospital. After you kill the assassin and Michale Corleone tells you to go to the basement, go forward and turn left. You will see Michael Corleone talking to Vito Corleone while he is in the hospital bed. This is Marlon Brando talking, which was recorded while he was hospitalized.