Walkthrough: Buffy, the vampire slayer
High School Revisited
Hallway
Kill the vampire and save the dude to get an elixir. Head for the boys bathroom to find a (gulp) girl in the boys room. Jump down the hole that is created and kill the beast to unseal the door and get the key card lying on the ground. Follow the path, climb up the ladder, and head through the door straight ahead. Head to the right and two screaming demons will greet you. Head for the keycard door and follow it to the EXIT. Head straight ahead and try to save the woman from the vampire.
Head into the double doors that are right next to the woman in distress and through the door on the left. After defeating the screaming demon inside, jump through the broken glass window and through the door to the left in the next room. Here you'll find a hellfire vial and a health crystal.
Once you exit through the broken window again, a female vampire with the grabbing spell will attack. Once out in the courtyard, two screaming demons are there, and after defeating them, a vampire comes immediately after them. Head up the staircase that is next the door you came from and head to the left at the top of the case, along the outer rim. You'll find a health crystal at the end of your path, as well as a vampire. Head back and back onto the normal path. Head down the normal path to find a holy water vial and a screaming demon.
Head back down the steps and all the way to the other end of the courtyard. Take a right after going down the steps until you hit the wall, then head right and you'll see a box on the ground. Break it to grab a hellfire vial. After doing that, head in the other direction and you'll see the green EXIT sign. Go there and kill the vampire in that area. There is a shovel to the right of the EXIT sign if you wish to use it. After going through the door, head right into the open room. There is a holy elixir on the right side, and the final door is to the left.
Sewers
Follow the path and you'll encounter two screaming demons. Save the man and you'll receive a much needed elixir. I highly suggest blowing up the barrels if you have arrows for there might be secrets. After climbing down the ladder in the room with the demons, there is a box to the far right of the ladder as well as door to go through. Go through it and at the end you'll have to fight off a shrimp and a screaming demon. Drag them into the hall you came from and one of them will go away if your drag them far enough. Using the reaper and the holding down Y attack is very effective. After defeating them, go down the ladder to the right and jump across the sewage on the platform to the other side. Punch the wall that looks different than the rest of the wall to get a holy water vial and a hellfire vial. Head back to the other side and go down the tunnel.
At the end of the tunnel, two shrimps are there. Kill them and then jump into the water. In here you'll find at the end of the tunnel an elixir. I highly suggest blowing up the barrels if you have arrows for there might be secrets. Then head back up the ladder and follow the path to the door at the top of the stairs. In the water to your left, you'll find a hellfire vial. When you walk up the stairs, a screaming demon will blast from the wall. Go through the door at the end of the path and after walking down the stairs you'll be greeted by two screaming demons. Go into the hole that the screaming demon created to find a power crystal.
Continue down the path and go through the door. Go right and go through the double doors. Go straight ahead and look to the right to find a box to break with an elixir in it. Go up the only ladder in the room and that will complete the mission.
Basement
Go directly behind you and open the double door. There is an elixir inside. Turn around and head straight and then left up the stairs. Head right and then right again if you wish to grab a spear in the door to the end of this hall. If not, simply turn left and through the double doors to fight two vamps. After those, another busts through the door. After that, you can find a hellfire vial in the far right corner of the room. Breaking all the chairs in the room will only provide one stake. Head out the door, to the far left, and through the door. In this room, break the only breakable box to get an elixir.
Head down the stairs and take the right path. Take a left at the bottom and two screaming demons will appear. Head back and into the bathroom to the right to fight a vampire. You can find a health crystal in the stall. Go back to the other end of the hall and through the open door. Go down the stairs and do a U-turn left to find a box with an elixir inside. Then head down the path and you'll defuse the bomb. After that, two vampires will attack you (one strong and one weak). After those two have been killed, another vampire will bust through a door to try and claim your life. After defeating him, head back to where you flipped the switch in one of the first levels. Break the box by the double door and you'll get a power crystal. Then head through the door that the vampire broke and down the passageway. You'll find two boxes on the left while walking. They will carry an elixir and a hellfire. Climb the ladder at the end of the hall and the mission is complete.
Quad
Boss: Malik
Malik transforms into a tiger-demon. He transports and combinations. He can also dodge you attacks by jumping backwards and he counters occasionally by thrusting both of his arms. He will also throw you on the ground and he'll grab your neck with his razor teeth. Try to avoid being chomped by pressing the kick button continuously to get out of that strangle hold. I trapped him in a corner and kept using the Y attack with reaper. He would counter, but only seldom. You must stake him to beat him. He can be frustrating, but keep at it and you'll prevail. After this, Spike calls for a truce.
Library
Talk to everyone (including Spike). Get your life and power upgraded and learn a new technique from Giles.