Silent Hill 3 cheats and cheat codes for PC

Beginner option mode:
During game play in normal mode, die twice.

Unlock the Life display in extra option screen:
Complete the game on Hard difficulty level

UFO ending:
Finish the game and unlock the Princess Heart costume and the 
Heather Beam weapon. Beat all bosses and monsters 
using only the Heather Beam. 

Normal ending:
Beat the game simply by not killing too many enemies. 

Possessed ending:
Kill over 100+ enemies (Preferably the unlimited sub machine gun)
Forgive the person in the church 
Take over 2000 points worth of damage

Extra interactive scenes:
Use a completed Silent Hill 2 saved game file. New interactions with some 
objects and new scenes will now be available. 

The flashback locations are: 
Examine the poster at Haven's Night. 
Examine the mail boxes across from Daisy Villa Apartments. 
Examine the 2nd stall in the 1F ladies room in the mall. 
Examine the small section of fence on the north side of the 
Brookhaven Hospital's Roof Area.

Unlock up to ten Extreme Action Modes (increased difficulty modes):
Finish the game in hard action mode to unlock Extreme Action Mode 1
Finish Extreme Action Mode 1 to unlock Mode 2. 
Finish Extreme Action Mode 2 to unlock Mode 3.
Do it until you unlock Extreme Action Mode X.
After finished the game on Extreme Action Mode X you will get 
the God Of Thunder T-shirt.

Unlock the Life Bar in extra option screen:
Complete the game on Hard Action Mode and Hard Riddle Mode


Unlock New Weapons

Flamethrower 
Kill more enemies by shooting than fighting.

Beam Sabre 
Kill more enemies by fighting than shooting.

Heather Beam 
Kill minimum 333 enemies or complete the game once in Hard mode

Infinite SMG ammo 
Beat the final boss with a melee weapon. 

Getting Silver and Gold Pipes 
Throw your steel pipe into the sewers.
Answer the following to 3 questions: No, No, Yes.

Green Blood:
Go to extra options menu. Set the blood color to green.

Douglas in Boxers 
Finish the game once, choose the "Extra New Game" option.
Press wwssqeqe [Esc] [Enter]. After you select a difficulty and 
riddle level to confirm the code. During the scenes Douglas will 
wearing a boxer.