right at the begining of level 15 after indy has been lowered in the lift he enters a room with a round object to the left and what looks like a puzzle to the right behind him there is a further room with a movable block in but every time you enter the floor lowers leaving no room to move it however it does expose a switch that is pressed in the yellow cross flashes in the middle of the first room i dont know what to do any ideas?

I am checking my guide but I need to know what is the title of the level. post as soon as possible. thnx