when you get on the platform that moves up and down try this: If you're standing facing the wall while standing on the platform, you should see a wall to your left when the platform is up as high as it goes. Now wall run on the wall and when you're almost at the end of your run you have to jump back and forth from the wall to the wall across from you. Keep jumping back and forth, higher and higher until you reach the top of the ledge.