While playing the game, press X(2), A, Left, Right, Left, Right, X(3), A, Left, Right, Left, Right. Then, press Start + Back to return to the main menu. Select the "New Game" option. All levels and game modes will now be unlocked. Note: This code cannot be disabled.
Successfully complete the game in Dead On Arrival mode to view a special ending.
Successfully complete the game on the "Detective" difficulty setting to unlock the Hard Boiled, New York Minute, and Dead Man Walking modes. Successfully complete the game on the "Hard-Boiled" difficulty setting to unlock Dead On Arrival mode.
When you just enter the warehouse and see the little cubicle with the television inside, go a few yards to the right and climb on top of the boxes. Jump across and you will get an Uzi.
At the start of the game, turn around and open the middle locker. Inside will be two bottles of pain killers to take whenever needed.
In the chapter where Max is suspended inside the police station, go into the rec-room. There will be two policemen sitting on a couch watching television. Walk up to the television and shut it off. The policemen will make comments to Max and they will get mad at him, but will not actually do anything.
During the level where you have to find a member of the inner circle in a fancy apartment complex, go to the part where two cleaners are outside the window on the lift. Kill them both and jump down from ledge to ledge until you reach the bottom. Run along the edge of the building until you hear a shotgun blast from the inside and see someone flying out of a window. Kill the cleaner in his apartment but do not go in. Continue along the buildings edge for slightly longer and you will find an open window. Inside, is a memorial for someone.
Play the piano with the dead body on top of it. Max will attempt to play his theme song.
On any of the levels where you are in the fancy apartments with the cleaners, find a flat-screen television. Take out your shotgun and shoot the television. It should fall off the wall like a painting. You should notice smoke coming from the wall where the TV was located. Walk up to the smoke and press the Square. It will make sparks on the wall, as if the television was still on it.
Go through the fun house until you reach Mona's hideout. Once inside, look around Mona's gym area and should find a poster of the famous Max Payne Mod "Kung Fu" by Kenneth Yeung.
As the battle starts, equip your MP5 and enter the scope mode. Look above the Vlad's location to see four cylinder-like wooden pipes holding the sitting-place (the square-like place that Vlad is on). Shoot the wooden pipes and they will fall out of their places. Remember to dodge Vlad's dynamite. As you shoot the last pipe, the sitting-place will fall down but Vlad is still out of your view. Look up again to see four more wooden pipes that are preventing a large pillar from falling down. Shoot the pipes out and the pillar will fall down, making Vlad move aside avoiding the pillar. After that Vlad, is in your view. Equip any desired weapon (M4 Carbine recommended) and finish him off. Note: Beware of Vlad's molotov burning bombs.