Do the following cheats in the original game and on the Normal skill setting.
Extreme Battle Game: Play through the game twice using the consecutively saved data from each character. After the end credits and the ranking screen of the second game scroll by, a new screen appears that says, "You can play another scenario if you make a new save data." Save the data. At the load data screen, select Arrange Data (Rookie Data for Arrange Game), and load the data labeled "???". When you load the data, you can play a hidden mini-game called Extreme Battle.
Hidden Skill Levels and Characters in the Extreme Battle Game: Each time you Þnish an Extreme Battle game, a new skill level and character are unlocked. After the Þrst play through, Ada and skill level 2 are unlocked; after the second play through, Chris RedÞeld and skill level 3 are unlocked.
Gatling Gun with Unlimited Ammo,The Survivor Mini-Game, and Hidden Film D
Gatling Gun with Unlimited Ammo: In either character's second scenario, finish the game in under two-and-a-half hours. During the game, save only once and use no first-aid spray. After the end credits and the ranking screen scroll by, a new screen appears describing your reward: a gatling gun-loaded with unlimited ammo. You can find this weapon in any chest.
"The Survivor" Mini-Game: Play through the game six times using the consecutively saved data from each character. Along the way, unlock the hidden "4th Survivor" mini-game (to unlock this game, follow the instructions from the cheat above to get the Gatling gun. After you have the gun, a screen fades in that indicates you have also unlocked "The 4th Survivor" mini-game). After the end credits and the ranking screen of the sixth game scroll by, a new screen appears that says, "You can play another scenario if you make a new save data." Save the new data. When you load the data, you can now play another hidden mini-game called "The Survivor." In this mission you play as a giant piece of tofu armed only with a knife that must make it from the sewers to the roof of the police station.
Hidden Film D: Enter the S.T.A.R.S. Office on the police station's second floor and search the main desk repeatedly until you find the film. Then go to the darkroom on the Þrst floor to develop it. The photo is of Rebecca Chambers from the first RE game.
Different Outfits, Secret Gun for Claire, 4th Survivor Mini-Game, and Submachine Gun and Rocket Launcher with Unlimited Ammo
Different Outfits for Characters and Secret Gun for Claire: Start a new game as either Claire or Leon and make it to the police station without picking up any items. Once in the station, load up on ammo and head back outside. Go down the stairs and shoot the zombie, Brad-he's tough, so it takes about 20 shots to destroy him. After he's down, search his corpse for the special key. The key opens one of the lockers in the darkroom, which has two different sets of clothes for Leon and a new outfit and secret gun for Claire.
Submachine Gun and Rocket Launcher with Unlimited Ammo and 4th Survivor Mini-Game: In either character's second scenario, finish the game in under two-and-a-half hours. During the game, save only once, and use no first-aid spray. You should get an "A" ranking. After the end credits and the ranking screen, a new screen appears describing your reward: a submachine gun and a rocket launcher-both loaded with unlimited ammo. You can find these two weapons in any chest. Following the "Your Reward" screen is another screen that says "You can play another scenario if you make a new save data." Save the new data. When you load the data, you can play a hidden mini-game called The 4th Survivor. In this mission you must guide an Umbrella S.W.A.T. member from the sewers to the roof of the police station.