When you purchased your copy of Assassins Creed Origins you may have been lucky enough to get an additional code for the Secrets Of The First Pyramids mission. This mission involves Bayek hunting down the treasure of Sneferu, the first Egyptian Pharaoh of the 4th Dynasty and was the one who introduced all the innovations and design elements of the pyramids that came after.
This mission has Bayek diving into the depths of one of Sneferu’s pyramids to uncover its secrets, which involves a unique puzzle that while simple is also quite irritating to figure out, especially in the dark.
While exploring the pyramid you will eventually slide through a small gap in the wall and enter a room with two platforms, one on the far side, which you can see in the screenshot and another one that is to the right of Bayek. You quickly realise that these platforms are linked and operate as a weight system. If Bayek stands on one it will drop while the other will raise. The problem comes in with the fact that you cannot simply run up the wall (no handholds) and the far platform sinks quite rapidly.
To solve this you must find these weighted objects that are on the ledge where you first enter the room. There are two of these weights that you must drop on the closest platform, which should be the one to the right of Bayek when you enter the chamber. These two weights should counteract your weight as you climb on top of the far platform and through the hole in the wall.
Eventually, you will reach another room with multiple platforms and assorted exits and entrances. The main chamber will have a couple platforms and an abundance of weights that you can use to access a loot-filled room up top. To progress with this mission, however, you need to take the right-hand chamber. Basically, it should have two more platforms in a similar set up to the previous rooms. Place a few weights onto the closest platform to where you entered, which will raise the other one up and keep it up, allowing you to once again climb through the exit.