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Resident Evil 0
Also known as: BioHazard 0
Alt. name(s): RE0, RE 0, Bio Hazard 0, RE Zero, Resident Evil Zero

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Ending Bonuses:
You can get certain prizes depending on your gameplay rank, which is how fast you beat the game. Here are the ranks and prizes.
D:(9:01 or more) Leech Hunter and Closet Key
C:(7:01 - 9:00) Leech Hunter and Closet Key
B:(5:01 - 7:00) Leech Hunter and Closet Key
A:(3:31 - 5:00) Submachine Gun, Leech Hunter, Closet Key
S:(3:30 or less) Rocket Launcher, Submachine Gun, Leech Hunter, Closet Key
New Costumes: If you complete the game on Normal or Hard mode, you'll find the Closet Key in Rebecca's Inventory when you start a new game. Billy will get a suit and Rebecca will get a leather outfit or a cowgirl uniform.
Leech Hunter mini-game bonuses: Successfully complete the Leech Hunter mini-game with one of the following ranks to unlock the corresponding bonus: "A" rank: Unlimited ammunition for any weapon, "B" rank: Magnum, "C" rank: Hunting Gun, "D" rank: Handgun, "E" rank: Submachine Gun.


One hit kills:
When playing as either Rebecca or Billy and you get bit by a zombie, move the character opposite of your main character directly behind the one you are controlling to have him or her shoot the zombie in the head and kill it in one hit, while the zombie deals you no damage. Note: You must have pistol equipped to save ammunition for a one bullet kill.
Extra inventory slot: When playing as Billy with Rebecca as the alternate character, have Billy hold all the pistol ammunition for both characters and keep her gun fully loaded. This gives you one free inventory slot.
Dail door number puzzle: Enter "4863" on Disc 2, where the cable car is located.
Chess puzzle: Look at the smaller chess board on the desk in front of the big one. Arrange the big pieces the same way. The difference is the only white piece by itself. Use Billy to push it down, to the right, and finally right in front of the black piece. The desk will now open.
Brake system puzzle: The main code is 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 7 + 2 = 81. This should activate the brakes for the train.
Fountain circle puzzle: When you get to the fountain circle with the six animal statues on Disc 1, use Billy to light the statues in the following order: Deer, Wolf, Horse, Lion, Snake, Eagle.
Pause timed puzzles: Try to change to your partner during a timed puzzle. Remain idle at the error message to give yourself more time to study the puzzle.
Piano room: When you get to the piano room, make sure you have both characters with you. Have Billy play piano. A door will open by the bar. Have Rebecca go in and take the battery. The door will close. Have Billy play piano again and the door will open.
Better shotgun use: Once you get the shotgun, do not use it. Instead, leave it in the room with the scale you put the two figures on. Find, but do not pick up, lots of shotgun ammunition. After you save her from the pit, give all the hand gun ammunition to Billy and collect the shotgun ammunition. If you get it all, she will have about 60 rounds, which is much better than using two hand guns.
Safer and faster shotgun reload: To reload the shot gun faster, press Y to go to the item screen. Combine the shotgun ammunition with the shotgun. You will be able to attack again without having Billy or Rebecca reload and waste precious time.
Hard mode: Use the following tips to complete the game in hard mode:
1. Use Billy all the time. He can take much more damage than Rebecca.
2. Leave Rebecca in the main hall. She just uses up ammunition and first aids. However, bring her the plants to mix for you.
3. Use a custom handgun, or if you dare, a knife to kill the tyrant. It is easy to run circles around him and shoot him in the head, or use the knife. It may require about 30 shots with the custom handgun to kill one.
4. Use the Magnum ammunition for the last Boss only.
5. Do not use the Pump Action Shotgun. It is weak. The Hunting Gun does more damage. Get it on the train and keep it.
6. Use Herbs only if you are really hurt bad.
7. Use Fire Grenades on the Leech People.
8. Use your Molotov Cocktails on the final Boss' third form, Tyrant, or Leech People.
9. Sometimes you can run pass the hunters and out the room without wasting ammunition, such as when you get the up key. The same goes for the Leech People. They are too slow if you use one person to run past them.
Save ammunition on first Leech zombie on the train: After the sequence with the first Leech zombie, just go back downstairs and the intermission sequence will take place again.
Avoid Leech Zombie explosion: When you fight the Leech Zombie, its legs will swell up at the end and explode, hurting and often killing you or your partner. There are three ways to avoid this. First, just leave as his legs are swelling but before he explodes. The second is to use a Molotov cocktail on him, which will light him on fire and melt into a puddle of slime and leeches. The third way is to kill him while he is still in "human" form, which is best done with the magnum and has the end effect as the Molotov cocktail.
Resident Evil 2 areas: When you eventually get onto the moving cable car, after Billy is taken over the railing by an ape, go across the ravine and head up the pair of steps. You will enter a big room with a metal floor. This is the same area in Resident Evil 2, where you call up the platform train to head down into the main factory (and where you fight a stronger version of the William Birkin mutations). If you go towards the bottom of the screen and go down the lift and into the back room, you will find a television screen with a picture of a Tyrant. This is the same room where you see Mr. X walking towards the camera before smashing it. If you call up the platform and take it down, you will enter the factory sub-levels and walk into the room where Leon/Claire had to carry Ada/Shelly to the security room.
Leech Hunter: Collecting Leeches: While playing the Leech Hunter mini-game, kill everything in the Mansion, Train Tunnel, and Basement before picking up any of the leeches. Once you pick one up, you cannot put it down. Each player can find a maximum number of 50 leeches (100 total leaches in the game). One item slot can only hold 10 leeches only -- be careful.
Once you get 95 leeches, zombies will start to come back to life. Collect the leeches in the mail hall, dining room, and the second floor room where you use the MO disc last so you do not get killed.
An easy way to complete Leech Hunter mode is to go through and kill all the enemies first, then return and collect the leeches. Note: Collect the leeches in the Basement area first to avoid the risk of revived Zombies.
Leech Hunter: Extra Submachine gun ammunition: As soon as Leech Hunter starts, grab the first leech you see and run out. This will give you a clip to the machine gun.
Leech Hunter: Finding the shotgun: When you are in the sewers, pick up the shotgun ammunition. Then, keep trying to pick up something and you will eventually find a shotgun.
Leech Hunter: Determining weapon: There is a way to determine if you will get the submachine gun or the magnum. Look at the two herbs in front of the stairs in front of you at the start of the mini-game. If the colors are blue and green, you will get the magnum. If the colors are green and green, you will get the submachine gun. The submachine gun can do what the magnum can and requires a lot less ammunition. Green and green is highly recommended.

Submitted by: CheatBookJon, AJ, B. Taylor, Aziz K and Martin Jukes

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