Design Chronos Gear
Combine the Gold Gear from the Clock Goddess Puzzle with the Silver Gear. The Chronos gear is used to activate clock bells. Insert it into the bell mechanism on the third floor of the Clock Tower.
Double Speed M4A1
This cheat requires a turbo controller. First, you must enable turbo for the X button. Now, hold the L1 button while pressing X to deliver a devastating blow out to the zombies or nemesis.
Easy magnum
In the place where you are chased by the zombies at the very beginning of the game (after you jump over the indusrial bin) go to the place where you get the back door key and there should be a cupboard at the back of the room go there and press x you should pick up gunpowder a (do this twice) then go to the box next to the typewriter and press x it should open. Trade one gun powder for the magnum and the other for its ammo.
Epilogues
Successfully complete the game under the hard difficulty setting to unlock Epilogues. Epilogues are a short diary description of each character in the entire Resident Evil series which describes what happened with that specific person after their adventure. Getting better ratings can unlock the other epilogues. There are eight total Epilogues that can be unlocked.
Get the Chronos key
To get the chronos key you must combine the chronos chain and winder key.
Get the Rocket Launcher
To get the rocket launcher, you must first defeat nemesis in the garbage disposal area to get the card key, then take the facility key to the machine that is next to the place where you put in the water sample. Use the facility key in the ultraviolet ray machine and it will put codes on it. You can the return to the room with the steam coming out of the pipes and go on the elevator. Use the facility key at the door at the end and you will get the Rocket Launcher
Ice Skating
Start running by holding down Square and a direction. Instead of holding square, repeatedly press it while moving. It will seem as if Jill is ice skating.
(Note: this trick only works with Jill, not with Carlos)
Infinite Money Trick
Use this method to get all the infinite-ammo weapons and infinite weapons pack. In the mercinary mode go to the area with the dumpster and the hop skotch paintings (the one right behind the bar.) Go up the steps and take a right. You will then go north until you get to the fork. Go through the door and you will be in the deadend alley that is boarded up by red and white boards. This can be done with all 3 mecinaries. There are three dogs here. First kill 2 dogs immediately. Then lure the remaining dog to where the boards are stacked up. Climb up onto the boards. Go to the opposite end and watch as the dog makes attempts to jump at you. Take a small step forward and press R1 right before he jumps. Your character will jump backwards and get a dodge bonus. Immediately after the character dodges, press R1 again to pick up a combo for your dodge bonus. Repeat this process to rack up tons of money and time. It takes time, but it is sure worth it.
Killing Nemesis
If you can, try and kill(disable) Nemesis at every opportunity you get. Every time you manage to kill him, he will drop an item for you. The items he drops are as follows.
1st time : Eagle part A
2nd time : Eagle part B
3rd time : 1st Aid Kit
4th time : M37 part A
5th time : M37 part B
6th time : 1st Aid Kit
7th time : Unlimited Ammo Kit
The Eagle parts combine to form the Eagle 6.0 handgun. It fires 9mm bullets and has a chance of causing a "critical" hit. This "critical" hit will kill any non-boss opponent with one shot, but it happens randomly.
The M37 parts combine to form the M37 Western Custom Shotgun. This is a shotgun a little bigger than a pistol and has a very good rate of fire. It only stores 6 shots of 12 gauge, but is still a very good gun.
The Unlimited Ammo Kit can be combined with any weapon in your arsenal to give it unlimited ammo (duh). I suggest combining it with the Magnum.
Magnum
Go directly to the Evidence Room in the Police Station. Go to the number-based lock with the S.T.A.R.S Emblem Key. Use one of the following three passwords: "0131", "4011", or "4312". You will receive the Emblem Key. Go to the locker in the S.T.A.R.S Office. Open the locker to get a Magnum.
Medical locker combination
To get the combination to the medical locker in the hospital, go to the room next to that room. Check the dead body in the corner to find one of the following combinations: "513", "101", "498", or "517".
Mixing Gun Powder
(Note: Additional mixing instructions are found within the game file on mixing.)
66 Handgun bullets * -- Gun Powder BBA
55 Handgun bullets * -- Gun Powder AAA
40 Shotgun shells -- Gun Powder AAB
35 Handgun bullets -- Gun Powder AA
30 Shotgun shells -- Gun Powder BBB
24 Magnum rounds -- Gun Powder CCC
18 Shotgun shells -- Gun Powder BB
15 Handgun bullets -- Gun Powder A
10 Acid rounds -- Gun Powder BC
10 Cold rounds -- Gun Powder CC
10 Fire rounds -- Gun Powder AC
10 Grenade rounds -- Gun Powder C (mix A with B)
7 Shot Gun Shells -- Gun Powder B
* Concocting large amounts of Handgun ammo wastes time, which affects your final grade.
Music Box code
One of the codes for the music box in the top or the tower is Down, Up, Up, Down, Down, Up.
Run on one foot
When running, quickly and repeatedly tap Square. Jill will run on one foot, and her other foot will never touch the ground.
Starting the trolley
The oil additive needed to start the trolley is located in a locked store room inside the sales office. To unlock it, pick up the flashy remote on a desk to turn on a TV. You will see a commercial about some product from Umbrella Corp. Make note of what the product is. Here are some that you might come accross: Safsprin, Adravil, Aquacure. Go to the nearby computer where Carlos just shot his zombied friend. You will be prompted for a password. Type in the name of the product. The store room is now unlocked.
Water combination code
At the water sample machine near the dead factory, enter "1 Right" for A, "3 Right" for B, and "4 Left" for C. That should unlock half of the lock to the door next to the elevator.