1) First you need to get the golden gun. To do this go to the right of the big blue pool and head straight to the door on the other side of the room. When you get near it there will be to guys guarding it. Shoot them and head into that room. Turn to your left. There will be a door on the wall you now face. Go in it and up the stairs, turn left into the room with the golden gun. You can follow my directions on the map to figure out how to get the gun.
2) Once you have the gun go out the door near the golden gun. Once you have opened the door pick up the bullet proof vest. Walk out the door infront of you and turn to your right while you are falling. When you hit shoot the guy directly infront of you. Do a 180û turn and shoot that guys then shoot the other two guys in the corners.
3) When you came out of the golden gun room and fell you saw a room straight ahead of you. Go there now. This is where you will meet Baron Semedi for the first time. Take out your golden gun and shoot him. He will die and then you will hear a laugh. That is Baron Semedi and he isn't dead.
4) From where you first killed Baron Semedi go to where you started using only the rooms you have already been to. This is so you don't have to fight extra people and waste time. Once you get here, you will see Baron Semedi. Kill him and run to the hallway that leads to the golden gun.
5) Instead of going up the stairs in that hallway go to your right and then take another right. You will go down stairs to a place filled with what looks like water. When you get out of the hallway turn right and go between the two pyramids and go in the other hallway. You will go up to flights of stairs and then you will see a room infront of you. As soon as you go in the room turn left and get the bullet proof vest.
6) Turn to your right and you will see Baron Semedi. Just strafe back and forth and shoot at him with the golden gun. Once you shoot him once he will start to roll around the room just keep shooting at him and eventually he will die!