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Sorry, I cannot remember the name of the pyramid, but I can get to the top room and insert the three shaft keys I have which in turn release beams of light onto the floor. Well the name of the level is the Mastabas. ;-) You'll find the Eastern Key in the level 'Khufu's Queen's Pyramids'. Not sure how much detail I should go into here, perhaps I'll let you go in there and search about, then you can ask me if you're still stuck (and it saves me going through a walkthrough length explanation). ;-)