Resident Evil 3 Cheats

Mercenary mode:
After finishing the game one time you will unlock mercenary mode and save the "Next Game" file. Start a new game, choose that saved game, then select mercenary mode. This mode involves controlling Carlos, Mikhal, or Nikoli from the train to the starting room with a two minute timer. Killing the various opponents and rescuing civilians during the journey will add more time to the clock. A rank and money will be awarded after the game is completed. The money can be used to purchase better weapons for the next mercenary mode game.

Alternate costumes:
Finish the game under the easy and difficulty settings with any rank better than "F" to unlock new costumes for Jill in the Boutique.

Once you have complete the game once and obtained the Boutique Key, Jill's alternate outfits are as follows: Police Women (miniskirt), the costume from Dino Crisis, a disco outfit, a biker outfit, and her S.T.A.R.S. outfit from the original Resident Evil. The grade you get at the end of the game (ranging from "E" to "A") will determine how many outfits you unlock. With "A", you get five new outfits, four for "B", three for "C", two for "D", and one for "E".
User Cheat by HamandCheese

Epilogues:
Finish 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.

Operation Mad Jackal option:
Finish the game under any difficult setting.

Jill's diary:
To get Jill's Diary (a file), collect all thirty files in the game in order. Then the first file (Instructions Manual, blue) will become Jill's Diary.

Barry Burton ending:
The only way to see Barry is if ending B is unlocked. To get this ending, jump off the bridge when fighting Nemesis Type B. After the jump off decision, the final area of the game will take a somewhat different path. You will have to fight off Nicholai in a chopper. It is recommended that you bring a Magnum and Grenade Launcher (or Rocket Launcher if it has been found). You can also choose to negotiate with him.

Barry Burton ending 2:
Jump off the bridge. Play until you reach the room with the Radar Tracker. Take it, and try to leave the room using the door you entered. Nicholai will call you. After killing him, Carlos will enter. After talking with him, leave the room (do not use the hatch to the Rail Cannon). Turn around and get in the radar device room again. Carlos and Jill will listen to a radio call from Barry and the game will continue with the final scenes.

Sneak past monsters:
If you can walk behind a monster, keep tapping Run quickly. Jill will not make any sound of footsteps and seems to "glide". The monsters cannot hear you and subsequently will not turn around and attack. REMEMBER: This works best with the Drain Deimos.

Additional slots:
When you first get to the trolley, Carlos will give you a "fanny" pack. After you finish the game, you will keep those additional two slots in the game.

Fighting Nemesis:
The Nemesis is left-handed and uses that hand to grab you. When fighting him, shoot him two times and run past his right side. Shoot twice and repeat the process. REMEMBER: This only works when he does not have his Rocket Launcher and if you are using the handgun.

Fighting a Doggie:
Knock down a Doggie, then aim down and you can fire faster on it. If you do not aim down, you have to wait until the Doggie stands up.

Humanoid sighting:
When fighting the Nemesis for the last time in the Rail Gun Room, you will see a figure in the background, similar to Nemesis. Closely observe the creature to see that it is the Humanoid, or the Mutated William Burken from Resident Evil 2. When you press Action, Jill describes it as "One of Umbrella's New Biotech Weapons".
User Cheat by ITT

Custom shotgun:
Play the game under hard difficulty. Defeat Nemesis for the fourth time and pick up the small silver box that he dropped. It will contain M37 Parts A. Defeat Nemesis a fifth time and get the M37 Parts B. Combine these two parts to get a western custom shotgun with six rounds. This gun uses the standard 12 gauge shotgun shells.

Grenade Launcher or Magnum:
Your timing will determine whether the Grenade Launcher or the Magnum can be found at the S.T.A.R.S. Office. If you go to the cabinet before the radio goes off, when you try to leave you will get the Grenade Launcher. If you go to the cabinet after the radio goes off you will get the Magnum. Whichever weapon is obtained, the other will be found in the power plant.
User Cheat by Cro

Grenade Launcher:
Use the S.T.A.R.S Card in the computer in the main entrance of the Police Station. When you get the S.T.A.R.S Emblem Key, go to the S.T.A.R.S Office. When you are in the office, go to the big locker next to the out-of-commission message receiver. Open the locker and you will get a Grenade Launcher.

There are two different ways to get the Grenade launcher. There is one in the Sub-Station when the game is first played. The other is available after the game has been completed once. Go to the S.T.A.R.S. office and go were the Magnum gun was originally obtained.

Rocket launcher:
In the dead factory, go to the machine next to the water sample puzzle. Use the facility key where that game states a small plastic card can be inserted. Take the other facility key that is given and go to the steaming room where the small card activated elevator is located .Go down and use the facility key on the door where that game states a small plastic card can be inserted. You will find a rocket launcher with four shots at this location.

STI Eagle handgun:
Kill Nemesis two times under hard difficulty to get the two parts for it. Combine them to get the STI Eagle handgun.

Vaccine medium combination:
One of the combinations when making the vaccine medium in the hospital is I, III, and A.

Stranded zombie:
After you put out the fire with the hose (where the first Cerebus dogs appeared) go to the first alley ahead of you. Enter the door and move up so the camera angle changes. To your left will be a row of windows. Look in the first window to see a zombie cop. You cannot shoot him, he cannot attack you, and there is no way into the building that he is in.

Campaign sign:
Go to the end of the hall with the save room behind the restaurant to find political campaign signs. Look closely to will see a sign that says "OTOM for U...S Senat".

Locker combination:
When entering the Police Station and going into the door in the top left corner, you will reach a room with zombies. After killing them, enter the next room, which contains the lockers. Go to the other side to find a locker with a light on it. The game will prompt for a code. The code (varies by game) is either "0131", "0513", "4011", or "4312".

Park fountain solution:
When using the water control unit in Raccoon Park to drain the fountain, you have to align the gray and black gears. The gears need to be moved in the following order to correctly align them and drain the fountain. Move the bottom left black gear up. Move the top center gray gear down. Move the top right gray gear to the left. Move the bottom right black gear up. Move the top center gray gear down. Move the top left black gear to the right.

Water sample solution:
When using the water sample machine in the abandoned Waste Processing Plant (Dead Factory), you have align the three lines of the water sample correctly to process the sample. There are four possible solutions (varies by game): A: 4 Right, B: 2 Right, C: 2 Left. A: 1 Right, B: 1 Right, C: 2 Left. A: 1 Left, B: 2 Left, C: 2 Right. A: 1 Right, B: 3 Right, C: 4 Left. This will unlock half of the lock to the door next to the elevator.

Hunk:
Look around in the room with the rail gun to find Hunk on the ground by the door you would exit through.

Mercenary mode: Unlimited money and time:
Get to the alley that has three dogs and a crate. Kill two of the dogs get on the crate. Continuously dodge the remaining dog for a time and money bonus for dodging.

Mercenary mode: Civilian locations:
The civilians that must be saved in mercenaries mode may be found at the following locations. REMEMBER: You must save them in this order or some of them will die. Also, You must kill all the enemies in the room with the civilians or they will not be saved.

1. Gas Station
2. Basement of the Restaurant
3. Third Floor of the Raccoon Press Office
4. Sub Station (where you got the fuse)
5. Sales Office
6. The Bar

Mercenary mode: Item box:
Once you complete mercenary mode with each character and bought all the weapons you can access the item box, but it only contains a knife.

Mercenary mode: S rank:
Get the combat knife, kill many monsters, rescue all civilians, and do not use healing items. Then kill every monster with the knife. You should end up with over an hour and some change.

Mercenary mode: 330 seconds:
Go to the part of the mercenary mission with two Nemeses and take out your knife. The Nemeses will kill each other, and you will earn 330 seconds.

Mercenary mode: 78 second bonus:
As any character, get to the branched zone, directly after the Raven's nest, You will see a barrel with zombies nearing your position. Just shoot the barrel -- it does not matter if you do not kill all of them. However, the more you kill, the more time you receive. This usually results in a 78 second bonus.

Mercenary mode: 44 second bonus:
As Mikhail, go past the city grounds gate and towards the Raccoon City Press. Before you reach the Press building, you will encounter a swarm of zombies. Equip the shotgun and blast away towards the densely occupied areas, thus resulting in a 44 second bonus. If you blast more than that, you will get an additional 22 second bonus. REMEMBER: Do not use the 44 second bonus if you are low on ammunition.

Mercenary mode: Larger reward:
Try to reach the area near the goal (just after the dimly lit hallway, near the intersection) with more than four minutes remaining on the game clock. Two more of the STARS-killing Nemeses will appear, both armed with makeshift rocket launchers!. This achievement results in a larger reward from the Big Fat Boss.

Mercenary mode: Saving ammunition as Mikhail:
When in mercenary mode, it is easy to waste ammunition. The following is a list of guns and the enemies they are most effective against when playing as Mikhail.

Magnum: Hunters
Shotgun: Zombie dogs and zombies
Rocket Launcher: Nemesis
Running past: Crows (especially) and most zombies