How do you get passed the weight game on Nabooti Island?

If you are referring to the tomb in Giza, than you will need to pull the lever to drop each of the mummy tombs in the order that appears on the wall. But , when you pull the first lever which is the largest tomb , sand will begin to drop and you have to pull each lever in the order before the sand covers the levers and time runs out. Afterwards , the mummy will be holding the blue jewel.