Start a game. Press Back during the game to display the main
menu. Then, hold L and R, click Left Analog-stick and click Right
Analog-stick, then quickly press White, Black, Black, White, White,
and Black at the main menu. The cheat menu will appear, which contains
"All Weapons" and "Refill" options. To access these cheats, press Back
during gameplay and select the options you want at the cheat menu.
Then, press Back to resume playing. Other cheat menu options must be
unlocked during gameplay.
Additional Difficulty Settings
Complete the game on "Fugitive" difficulty to unlock the "Dead On
Arrival" and the "New York Minute" settings.
Bonus Bullet Time Level
Complete the game on "New York Minute" difficulty to unlock a
bonus level where you have to kill a lot of enemies, all in bullet
Fight the Rats
In Part 1 Chapter 2, at the very beginning, throw a grenade (you
must use the "All Weapons" cheat to have one) in the hole in the brick
wall in front of you. Select Show Objectives, and a new objective will
appear: a war against rats. Continue the level and pass the sewer,
then go up the stairs. There you will find armed rats to battle.
Complete the game on "Dead on Arrival" difficulty, using no
codes, and you will be transfered to the "Final Battle." There you
must fight several enemies in permanent bullet time. If you can defeat
them, a door will open, revealing a secret finale.
Secret tutorial room
Play the tutorial until you reach the end, where you can practice
shooting enemies. Jump up on the big van located there, then over to
the ventilation fan on the wall next to the van. From the fan, jump to
the stairs and climb them to the top. Break through the window. You
will find an Ingram in the room.