Max Payne Cheats

When your in the level with the hotel near the end you will see a drum
set and two microphones, and a guitar lying on the ground you can jump
behind the drums and hit the "A" button, then go up to the
two mikes and hit the "A" button and he will say "karaoke
isn't my thing" Or you can jump on the guitar and it will make a
little squeal.

When you find boxes that are not very big or steel, swing your baseball bat or lead pipe at it. This will open those boxes easily without wasting bullets.

Cheat mode
Start a game. Press Back during a game to display the main menu. Then at the main menu, hold L + R + click Left Analog-stick + click Right Analog-stick, and quickly press White, Black(2), White(2), Black. A cheat option will appear.
The cheat menu will have "All Weapons" and "Refill" (restores ammunition, painkillers, and bullet time) options. To use these cheats, press Back during a game and select the desired options at the cheat menu. Then, press Back to resume the game.
Note: Other cheats in the cheat menu must be unlocked during the game.
Additional difficulty settings
Successfully complete the game on the "Fugitive" difficulty setting to unlock the "Dead On Arrival" and "New York Minute" difficulty settings.
Bonus level
Successfully complete the game on the "New York Minute" difficulty setting to unlock a new bonus level where you have to kill a lot of enemies, all in bullet time.

PRESS START WHITE 2 TIMES,BLACK,A,B,X,Y 3 TIMES,AND R

Successfully complete the Last Challenge level. The doors in the back of the room will open up to the Remedy Room.

Complete game in easy or hard mode
you will then get two more difficulty settings and in "cheats" menu you will have get all weapons option.