Once you are in the Royal Museum level, go through a door with a pyramid picture 
next to it. You will immediately see a giant pyramid. Go around the pyramid until 
you see a door. Go in the door. Lepelt will be standing behind a pot. Do not go 
over there yet. Jump into the sarcophagus that he planned for a trap and let the 
puppy trap him. Once the puppy has trapped him, jump on top of the sarcophagus 
and go where the face is. He will say a few different things each time you jump 
on him.