Super Stamina
For limited invulnerability, mix the green, blue and red herbs in that order. You MUST mix the herbs in that order, or they will not work. Green and Blue MUST be mixed together first, then you add the red herb.

Alternate costumes
For alternate costumes, first get the special key in the first scenario, by getting to the police station without picking up any ammo. Then get the box of handgun ammo off the desk near the computer. Go back outside, and down the stairs you will see a zombie, wearing camouflage pants and a yellow vest, who normally isn't there. He'll take about 30 shots before going down. When he finally does, search him to get the special key. Take it to the save room where you develop pictures, and inside you'll find a locker
that the key will open with a change of clothes waiting inside.

Play as Hunk and Tofu
Hunk: The fourth survivor is a bonus game mode that features another playable character named "Hunk." Hunk is one of the soldiers who tried to take the G-virus from William, as seen during the midgame CG FMV. Hunk's mission is to get from the sewer to the second floor of the police station. It is a battle mode with no puzzles to solve or items to pick up. To open up this mode, beat the second scenario for either of the two characters with an "A" rating. Tofu: Tofu is yet another playable character. He's actually a giant piece of tofu, who plays the same scenario as Hunk but is armed with only a knife. To open up Tofu, you must play through the game three times. Play through a first scenario, then it's corresponding second scenario. Then the other character's first and its second scenario. Then finally the first and second scenario all
over again. If you can finish each one of the six scenarios each with an "A" rating then you can play as Tofu.

How to get the three secret weapons with infinite ammo
Beat the 1st Scenario in under 2 1/2 hours with a B or A ranking. Gatling Gun:
Beat the 2nd Scenario in under 2 1/2 hours with a B or A ranking.
Submachine Gun:Beat the 2nd Scenario under 3 hours with a ranking of B or A.
All 3 Weapons:
beat the 2nd Scenario in under 2 1/2 hours with a ranking of B or A.

See a picture of all the original S.T.A.R.S. members
To see a picture of all the original S.T.A.R.S. members go into the room on the 2nd floor in the police station where you run into Claire and tell her that her brother is dead and look at the wall on the left side of the room; right of the trophy case and examine the picture on the wall and the screen will do a close up on the picture.

Serpents Stone
To get the Serpents Stone enter the library on the second floor of the police station, walk up the stares. Now walk over to the part ware the floor is week and fall down into it. Push the power to the book case and get out. Now that your out head on over to the book case that is farthest to the left and move it to the right, move to the next one and move it to the right. Viola! The Serpents Stone is your's.

Extra machine gun ammo
For extra machine gun ammo, get to Umbrella's secret lab with Leon A or Clair A. You'll find a room with a huge moth. Kill the moth and the larva on the computer. Go up to the computer and type in nemesis. Then go all the way back to the place where the frozen room was but instead of going into the frozen room open the shutters or if they were already open go past them where you'll find another computer. Use the computer and you'll enter in your fingerprint. then beat the rest of the game and you'll get Claire or
Leon B. Do the same thing again and it will open the door just beyond the computer. Kill the lickers that are inside and grab the machine gun ammo next to the dead guy.

Stay healthy for quite a while
This is a trick for health but it lets you stay healthy for quite a while. What you have to do is mix the green herbs with the blue herbs then, the green herb and blue herb to the red herb then when you look at it it will look a brownish color. You have to do it in that exact order or else it will not work.

Weapon upgrades
When you play the game as Leon, there are two weapon upgrades; one for the shotgun and one for the magnum. When find the upgrades (in the game it will say "shotgun parts" or "magnum parts") you combine it with the weapon it says. The shotgun parts are in the sewer. You get them when you check a dead guy. The magnum parts are in the lab.

Final boss tip
An easy way to beat the final boss for the first scenario as Leon is to use your upgraded magnum for the first boss. He then will mutate into a rino type monster and the easiest way to beat it is to shoot it with your shotgun when it isn't trying to kill you.

Moonwalk
This is a pretty funny character movement that works best with Leon. Just get a good camera angle, then tap down on the joy stick. Type down very fast and he will appear to do the moonwalk. Now isn't that more fun then shooting zombies?

Invincibility
Invincibility is At the load game screen, press Down(4), Left(4), L, R(2), L, C-Up, C-Down. If you entered the code correctly, the game will return to the main menu.

Infinite ammunition
At the load game screen, press Up(4), Right(4), L, R, L, R, C-Right, C-Left. If you entered the code correctly, the game will return to the main menu.