In leval 4 when you start the leval go through the the door after you first start.Take a left but stop.Look up and you will see a light thing on the left and right on both walls.After jump on the light thing and jump up onto the wall and hold L3.Now you are on top of a building.Next turn around behind you and walk along a wall.Turn left and jump across to the allyway.Walk up a bit and turn right after go up against the wall and look down.Take a gernaid and throw it on the ground wait till the gernaid is about to explode and jump.You will be on another roof top.Turn left and walk straight up untill your at the enge and jump accross onto another roof.Now turn right and walk up until you see a allyway on your left.Walk in the ally way and you will see a block.Jump on it then Turn left and jump on the roof.Next walk up a bit and turn right.Jump off of the roof and walk straight up untill you see a ledge.Jump up on the ledge and look a bit up.Then jump up and hold L3.When your on the roof top walk straight up and jump off.Now you are on another building.You will see a trail that leeds you on to another roof.If you look around you will see a big hole in the corner of the roof.Jump through and now you are in a small room.Look around and you will see a saber sword.HOPE I HELPED