Resident Evil 0

New outfits for Rebecca and Billy:
Finish the game once and reach any rank in normal or hard mode.
When you next time start a new game, you will get the closet key.
You can use this key to unlock the closet in the room, where
you found the Hunting Gun.

Unlock Leech Hunter mini-game:
Finish the game once and reach "B", "C", or "D" rating.

Unlock Leech Hunter mini-game and Submachine Gun:
Finish the game within a time between 3:31 and 5:00 and reach
an "A" rating.

Unlock Rocket launcher, Leech Hunter mini-game and Submachine Gun:
Finish the game with less than 3:30 for an "S" rating.

Note: To get a rank after finish the game, you need to play at least
in normal mode. If you play in easy mode you will not get ranked.

Leech Hunter bonus weapons:
Finish the Leech Hunter mini-game and reach the following ratings to
unlock various bonuses:

Unlimited ammunition for any weapon
Reach A rank (100 leaches) in Leech Hunter mini game to
unlock unlimited ammunition for any weapon.

Magnum
Reach B rank (30-59 leaches) in Leech Hunter mini game to
unlock the Magnum.

Hunting Gun
Reach C rank (60-89 leaches) in Leech Hunter mini game to
unlock the Hunting Gun.

Handgun
Reach D rank (90-99 leaches) in Leech Hunter mini game to
unlock the Handgun.

Submachine Gun bullets
Reach E rank (1-29) in Leech Hunter mini game to unlock the
Submachine Gun bullets.

Bonus slot in inventory:
If you play as Billy with Rebecca as the alternate hero, have
Billy hold all the pistol ammo for both hero and keep her gun
with the maximum ammo. This means you have a bonus
slot in your inventory.

Get the battery in piano room:
Got to the piano room with both of your characters. When Billy begin
to play on the piano, the door will open by the bar. Go with Rebecca
to pick up the battery, when the door is close, play on the piano
again with Billy to open the door.

More time in puzzles
Switch to your partner when you found a timed riddle. Do not move
at the error message to give yourself more time to solve the riddle.

Open the Dail door (near cable car)
Enter the following number to open the Dail door on Disc 2: "4863"

Activate the brakes for the train:
To solve the Brake system puzzle use the following code:
9+9+9+9+9+9+9+9+7+2=81.

On the train if 36 enter the number 3 nine times and enter 9 one time
if 67= 7777777774444
if 81=8888888889
if 42=4444444446
if 53= 5555555558
Submitted by: red strike

Fountain circle with the six animal statues puzzle:
Light the statues with Billy in the following order:
Deer, Wolf, Horse, Lion, Snake, Eagle.

Receive ending bonuses:
Reach different ranks to unlock the ending bonuses. The earned rank
depending the amount of time it took for you to complete the game.

Rank - Hour of game play - Bonuses:
Rank S - 3:30 or less - Closet Key, Rocket Launcher, Leech Hunter, Machine gun
Rank A - 3:31-5:00 - Machine Gun, Leech Hunter, Closet Key.
Rank B - 5:01-7:00 - Leech Hunter and Closet Key.
Rank C - 7:01-9:00 - Leech Hunter and Closet Key.
Rank D - 9:01 or more - Leech Hunter and Closet Key.

One hit kills
Shoot the zombie in the head and kill it in one hit