Resident Evil 0

Successfully complete the game with any rank under the normal or hard difficulty settings. Start a new game. A Closet Key will appear in your inventory. Use it to unlock the closet in the room where the Hunting Gun was first found to access new costumes for Rebecca and Billy.

Successfully complete the game with a "B", "C", or "D" rank to unlock the Leech Hunter mini-game.

Successfully complete the game with a time between 3:31 and 5:00 for an "A" rank to unlock the Submachine Gun and Leech Hunter mini-game.

Successfully complete the game with a time of 3:30 or faster for an "S" rank to unlock the Rocket Launcher, Submachine gun, and Leech Hunter mini-game.

Note: To a rank after completing the game it must be played under the normal difficulty setting. You will not get ranked under the easy difficulty setting, but can still unlock the Leech Hunter mini-game.

At the church run, past the bat then enter the save room. When you exit back out, you will find the bat dead.

With the shotgun, aim down to the zombie's leg and blow it away. He will fall. Then, take out the handgun and shoot him one more time.

The solution for the animal puzzle is Deer, Wolf, Horse, Lion, Snake, Eagle.

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.

Run through a door when it is swelling. Make sure that nothing is attacking you or your partner when doing this, Return to the room and there will be no extra leeches will no one hurt.
Cyberlumbee.

If you have the hunting gun with unlimited ammunition from the Leech Hunter mini-game, equip Rebecca with it. She shoots faster than Billy. Billy shoots once per second, while Rebecca can shoot about two or three times per second.

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.

In order to start the train brakes, you must find the Magnetic Keycard (lying on the train control panel in the front car) and you must choose a character to go through the train. Do not choose Rebecca to go through the train. There are too many zombies for her to handle, and she will die. It does not matter if you killed all the zombies in the train, as more will appear. Once you have reached the caboose, use a healing item if necessary. Activate the control panel by using the Magnetic Keycard on the panel. The game will randomly choose one of three numbers to display, and you must figure out what ten numbers add up to the displayed number. The three random numbers and their solutions are as follows:

36: 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 9
67: 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 4
81: 8 + 8 + 8 + 8 + 8 + 8 + 8 + 8 + 8 + 9

After doing this, take control of Rebecca and she will do the same thing (but you do not need the keycard). She also has a set of three random numbers to solve. However, unlike Billy, they will not display your current total. The second control panel's three random numbers and their solutions are as follows:

42: 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 6
53: 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 8
67: 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 4

You have now completed the 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.