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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.
Play the piano with the dead body on top of it. Max will attempt to play his theme song.
Successfully complete the game in Dead On Arrival mode.
In Chapter 7 continued of Part 1, after you kill Kaufman and his henchmen at the end of the level, go back into the vacant apartment you went through to reach the lobby where you fought Kaufman. In the apartment, you should find a home-theatre system. Turn on the flat screen TV. You will see a short video.
Unlock All Modes
Enter the following during game play:
X, X, X, A, Left, Right, Left, Right, X, X, X, A, Left, Right, Left, Right
Complete the game under the "Detective" difficulty setting to unlock the Hard Boiled, New York Minute, and Dead Man Walking modes. Complete the game under the "Hard-Boiled" difficulty setting to unlock Dead On Arrival mode.
Part 1, Chapter 6: Kung Fu poster:
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.
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.
When playing part 3 - 'A mob war', and you've shot all the cleaners and mafia members in the street. Continue down the street past the door where the guy with a shotgun appears and turn left to face a road barricade. You will see one of those explosive barrels next to a set of shutters. Shoot the barrel and the explosion will knock down the shutters revealing boxes filled with grenades and striker ammo