Attempt to deactivate the trap
Once you find the mini-game pyramid you will have to attempt to pick the Lunia gold on one of the 4 sides of the pyramid there. Once you find the side with the mummy located it in, you have 5 minutes to loot everything you can. But do not think you just go crazy in there and loot everything you see.
Once entering the pyramid you will be in the first chamber that requires level 21, to enter. So now you will want to right click on the wall and attempt to deactivate the trap. Once through, look on the wall for an odd looking wall to pick.