Resident Evil 2: Dual Shock Cheats (PlayStation)

Get to the police station as fast as you can without picking up any items. Go to the
stairway next to the RPD entrance and kill the zombie (Brad Vikers from Resident Evil.)
Then make your way to the dark room on the first floor under the stairs. Unlock the
cabnent to find 2 outfits for Leon, 1 outfit and a revolver for Claire.

First you have to beat the game on "origional"
mode.  Then beat scenario B will an A ranking and
you will get to play a new scenario called "Extreme
Battle" where you have to get to the Police Precinct
and find four bombs.  Beat that and you will get Ada
as a character.  Beat it with her and you will get
to play as Chris Redfield from the first Resident
Evil.  

(this only works with the Dual Shock Edition)

Beat the original version as Leons first scenario and then Claires 2nd scenario. After
that, extreme battle mode will be available. Beat level 1 to unlock Ada Wong and beat
level 2 to unlock Chris Redfield (Claires older brother, the Resident Evil hero.)

First press select while playing to get to the menu screen. Then go to " Key Config." Now
press x on " Key Config." Now hold R1 and press square 10 times, you will hear a sound if
done correctly. NOTE: This code ONLY works for Resident Evil 2 Dual Shock Ver.

During a game press select to go to the options
screen.  Go to Key Configuration and highlight
Configuration A and hold R1 and press square 10 times.
The word manual will turn red.  You can also do this
code in Extreme Battle, Hunk, and Tofu's games.