Unlimited Ammo  -  Begin game play then press Start to display the options screen. Select the ''Button Config.'' option. Highlight ''Aim'' then hold R and press Z 10 times. The white boxes around ''Config'' and ''Aim'' should change to red to confirm correct code entry.

Film D  -  Search the desk on the left side of the S.T.A.R.S. office. The phrase "Its trashed someone must have searched it" will be displayed. Repeatedly search the desk approximately fifty times until a roll of film is found. Take the film and develop it in the photo lab to see a picture of Rebecca in a basketball uniform.

Bonus weapons  -  Successfully complete either character's first scenario in under two hours and thirty minutes with an A or B ranking for the rocket launcher with infinite ammunition. Successfully complete either character's second scenario in under two hours and thirty minutes hours with an A or B ranking for the gatling gun with infinite ammunition. Successfully complete either character's second scenario in under three hours with an A or B ranking for the machine gun with infinite ammunition. Note: The bonus weapon will appear in the next game after the first chest is opened.

Hunk scenario  -  Successfully complete either character's second scenario in under two hours and thirty minutes with saving less than twelve times. Hunk is a soldier that must reach the second floor of the police station from the sewer with just battles and no puzzles.

Tofu scenario  -  Successfully complete either character's first and second scenarios in less than three hours. Then, play the game again with the other character, and successfully complete their first and second scenarios in less than three hours. Play the game a third time and complete either character's first and second scenarios again in less than three hours. Note: The game must be saved less than twelve times during each of the six scenarios played and bonus weapons must not be used. Tofu is a piece of tofu (food) that must reach the second floor of the police station from the sewer with just battles and no puzzles. Tofu can not use any weapons other than a knife.

Alternate uniforms  -  Start a game on the normal difficulty setting. Then, go to the police station without collecting any items. Quickly move past the zombie that appears in the alley near the police station. Collect the shotgun, then kill the zombie. Take the special key from the zombie's body and go to the dark room to open the lockers with alternate uniforms. Claire has a single alternate uniform, with a quick shooting revolver. Leon has two alternate uniforms, one of which will allow him to shoot with one hand.

Extreme battle mode  -  Successfully complete both of either character's scenarios with an "A" rank, then go to the "Special" option. A new "Extreme battle mode" selection will be unlocked.

Play as Ada Wong in extreme battle mode  -  Complete extreme battle mode level 1 with any character.

Play as Chris Redfield in extreme battle mode  -  Complete extreme battle mode level 2 with any character.

EX file locations  -  1. Scenario A: In the cabinet in the file room.

2. Scenario B: On the desk in the Culture Experiment room of the Lab.
3. Scenario B: On a Umbrella soldier body in the Sewer B2 Wastewater Channel (east side).
4. Scenario A: Go behind the counter of the Gun Shop, on top of the counter.
5. Scenario A: In the briefcase near the end of the Bus at the beginning.
6. Scenario B: On Hot Dog Cart on the first street.
7. Scenario A: On the table in the room with the Fans and the blue doors in the Police office.
8. Scenario A: On Jill's desk in the S.T.A.R.S. office.
9. Scenario B: On Rebbeca's desk in the S.T.A.R.S. office, near the first aid bag hanging on the wall.
10. Scenario B: In the passage with stairs just outside the Police station doors.
11. Scenario A: The Lab, in the B4 Vaccine room.
12. Scenario A: The observation room of the police station on table, the one-way glass.
13. Scenario B: In the Lab in on the desk in the P-4 Laboratory-across from the moth room.
14. Scenario B: On the table in the room were the Chief dies.
15. Scenario B: In a cabinet in the monitor room that shows the Tyrant in the Factory.
16. Scenario A: In the Library of the Police station in a bookcase on the northern upper level.

Unlimited ammunition  -  Go to options during gameplay go to controls and highlight aim hold R and press z(10).

Play as Hunk:  Complete both of either character's scenarios with an "A" rank.

Play as Tofu:  Complete both of either character's scenarios with an "A" rank, and Hunk's scenario with any rank.

Unlimited ammunition:  Begin game play then press Start to display the options screen. Select the "Button Config." option. Highlight "Aim" then hold R and press Z(10). The white boxes around "Config" and "Aim" should change to red to confirm correct code entry.

Extreme battle mode:  Complete both of either character's scenarios with an "A" rank, then go to the "Special" option. A new "Extreme battle mode" selection will be unlocked.

Play as Ada Wong in extreme battle mode:  Complete extreme battle mode level 1 as any character.

Play as Chris Redfield in extreme battle mode:  Complete extreme battle mode level 2 as any character.

Alternate uniforms:  Start a new game with Leon and choose your settings to: red blood color and normal difficulty. Begin the game, and advance past the opening sequence. Do not pick up any items and try to avoid using your handgun bullets (you only really need them for the zombies in the bus and the zombie with the key - avoid the rest of the zombies). Get to the police station gate and go to the lower level stairwell. Outside you should see Brad Vickers (from Resident Evil 1 and 3) as a zombie. Use the rest of your clip on him. If he is still standing after that, run into the police station and get the handgun bullets on the desk near the computer, then go back outside and finish him off. Check his body to find a Special Key which will allow you to change clothes in the Dark Room (where you develop film). Leon has a leather jacket with skull emblem and an old S.T.A.R.S uniform with a baseball hat and Claire has a leather suit with a fast firing pistol called the Colt SAA. Another way to kill the zombie easily is to go up close and shoot his legs to make him fall forward, Then allow him bite your leg and you will crush his head. However, only do so if your condition is at Fine or Caution. If you get hurt by the zombie, get the herb in the garden at the top of the stairwell. This trick allows you to get the uniforms without completing either scenarios. The only difference is if you complete the game you see a short sequence that says "Do not pick up any items at the police station!".

Complete either character's first and second scenarios in less than three hours. A zombie in a uniform will appear after both missions are completed to confirm correct code entry. Load the saved game and begin the first scenario by going to the police station without collecting any items. Quickly move past the zombie that appears in the alley near the police station. Collect the shotgun, then kill the zombie. Take the special key from the zombie's body to open the lockers with alternate uniforms. Claire has a denim jacket, with a quick shooting revolver. Leon has two alternate uniforms (a leather jacket with skull emblem, or a tank top and baseball hat), one of which will allow him to shoot with one hand.

Shotgun or crossbow:  When playing as Leon go to the gun shop with the man. He will almost shoot you. After he dies because of the zombies, kill them. Then go up to the dead man and press Action. You should get a shotgun. If playing as Claire you will get the crossbow.

Ranking system:  To get an A ranking, beat the game in under three hours and do not use any First Aid sprays. Herbs, however, may be used. To get a B ranking, successfully complete the game in under three hours. To get a C ranking, finish the game in five to seven hours. For a D rating, finish the game in seven hours or more. Note: The rank will be lowered by one grade if any special weapons are used, or if the game was saved more than twelve times.

To get the "S" rank on mission 1, complete the game in under 1 hour 30 minutes, only use up to one green herb, do not save, and only use a knife, handgun and shotgun/bowgun or magnum/grenade launcher. I.e., if you pick up the shotgun/bowgun do not pick up the magnum/grenade launcher; or if you want the magnum/grenade launcher, do not pick up the shotgun/bowgun. Also, no weapons upgrades are allowed on any weapon and only one of each type of weapon. I.e., do not pick up the shotgun/bowgun from the dead shopkeeper then pick it up later in the game.

Rebecca Chambers picture:  Walk into the S.T.A.R.S office, go to the back of the room and click on the desk with the "This desk is trashed someone must of searched it" description. Search the desk fifty times to find a photo of Rebecca Chambers as a basketball player.

Dead Hunter:  Unlock the room in the Lab which requires two people to enter. In the Culture Experiment Room is find a dead Hunter from the first Resident Evil game and a group of strange experiments.

Getting the Precinct Key:  Go to the second floor, kill the Licker, and then go to the room with a door with S.T.A.R.S. written on it. Get the diary (green book), get the unicorn medal, talk to your "friend", and go down the stairs back to the fountain in the hall. Stand in front of the fountain and use the unicorn medal.