In silent hill 3, there is a special room which you can enter when you are in the Daisy Villa apartment. Upon entering, you will meet several monsters inside there and the place is pretty dark with only your pocket light to help you see in the room.
In the kitchen, there is a special boss which you will have to fight.
The boss turns out to be The Glutton which you met previously. The fight is not easy and is pretty tough to win.
Once you have defeated the boss you will receive a lots of health drinks and shotgun ammo plus a bonus code to unlock a special T-shirt.