Walkthrough: Buffy, the vampire slayer
Mausoleum
Secret Passageways
Head straight forward to the statue and grab a hellfire vial to the left. Then head to the right of the statue and climb up the stairs and into the next room. A switch on the left hand side will open the gate, but it will also release a skeleton. Walk back into the first room and you'll have to fight another skeleton. Go through the area that used to be gated off and magically sealed. Follow either path and go up the stairs to push the two glowing buttons on each side of the staircase. These open up two passageways. Go to the left one and jump down. In here, press the outer buttons to open the gate. Go through the gate. As you proceed forward, you'll have to fight two skeletons. In the next room, you'll find an elixir and a switch to press. Press the switch and head back into the other room.
Head right down a narrow passage way and defeat the undead creature. As you reach the end of the path, there is a different colored and shaped part of the wall. Kick it in and get a power crystal. Then head left through the passage and go through to passage in which you opened earlier but didn't go through. Once you jump down, follow the path and hit the switch at the end of it. You'll have to fight off two skeletons first. After pressing the button, two more undead will come after you. After defeating them and pressing the button, the tomb to the left holds a health crystal. You can also jump up on a tomb on the left and jump up to a special area where you can grab a hellfire vial.
Head back through to the first area and go through the newly opened gate. Press the button in the room and head back to the other switch area. Here you'll find a tomb to climb on the left and passage way to jump up to and walk through. You'll have to fight two skeletons first, however. Once going through the passage way, two female undead await your arrive. Head up into the passageway room and fight two skeletons. Click on the button you just revealed through all that hard work and go through the new passageway. This part of the level is completed.
The Catacombs
After you restart, head straight down the stairs and to the right. Once you enter the room, turn right immediately to pick up an elixir and then head for the big tub of hellfire to refill your water gun. Head right down the path and spray the spider web sealed doorway with your hellfire gun. Go refill it and head back to the door. Once you enter the room, spiders will fall from the ceiling. You can kill them with your crossbow, but squashing them and kicking them against the walls is much more fun. Spray down the web covered door and continue down the path to confront two skeletons. Fill the bowl that is surrounded by candles with hellfire juice and kill the skeleton that comes after you.
Go through the gate and head left down the stairs attached to the small bridge. Head straight through the tunnel and follow along the wall, jumping from platform to platform. One spider awaits you at the end. After exiting through the arch, head right and you'll encounter a female undead. In this room you'll find an elixir straight ahead. To the left you'll find another bowl. Fill it with some more juice and go through the door that is revealed. One skeleton stands in your way. Jump down (but watch out for the pit below you) and head straight. You'll fight two undead, but a refilling station for the hellfire gun is to your right. Then go to the left and kill the three spiders to lift the gate where two undead await your arrival. Continue down the path and you'll encounter three more spiders and a skeleton. Break down the web wall and jump onto the platforms, but don't forget to pick up the power crystal on a low platform to the right before you start to climb the platforms. Three spiders await you and an endless drop is below you so be careful. Once you have climbed to the top, fill the bowl with more of the love juice and watch the closed gate magically open.
Head to the left and there is a path that is barely visible. Follow that along the wall and, as you approach the exit, you can jump onto a platform and grab an elixir. In the next room a gate will open for you, then take a left up the stairs and another left at the top of the stairs to go through the gate you just opened. Three skeletons stand in your way in completing this part of the level.