you just be cool and relax
It is the final challenge in the tomb under the Sphinx on Nabooti island. (for the solution, see the related question)
you go to nabooti island
You have three more challenges, beginning with a block sorting problem, then a block climbing problem, and a room filling with sand. (see related question)
You do this and that and this and that, can you do this for me? I have no idea?
The four challenges are the dashes, the blocks, the collapsing floors, and the sand statues.
Inside the Sphinx at Giza, you face four challenges. The third is the "falling blocks" and the final one is the Sand Room where the Blue Jewel is located. (see the related questions)
Get the Blue Jewel from the small mummy case at the top. Exit left to leave the tomb.
You can leave anytime by backtracking. To leave from the falling blocks or sand room, there is a passage to your left. (see the related question)
There are levers that reset the block puzzle (right there), and the sand room (at the left side), but only if you fail the challenge.
There are statues with dots inside the Sphinx tomb, as part of the Sand Room challenge. (see the related question)
you will see dots on the statues go i numeric order and then steal the pearl from the mummy
Beating the sand room gives you the Blue Jewel. Go left to exit the tomb. You will still have collect the other 4 jewels before taking them all back to the museum.