Cheat Mode
     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
time.

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.

Secret Ending
     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.