I made it past the guys on the tower, finally broke the tower made it to a room with 2 magnets and the ball is stuck. If I stand on one of the blue tiles the ball whips over to the other magnate. The clue says to activate the blue tile at the end of a corridor. I have been down every corridor and room 10 times and have not found the "blue tile at the end of a corridor that will release the ball when I stand on on of the tiles in the big room." GGGrrr