In this layer, the Simulationists have reached the pinnacle of their art form. A world of nested simulations, each pretending to be a real world. It's a never-ending staircase of deception, where the simulated simulated are the new norm.
But beware, traveler, for in this layer, the lines between reality and simulation are blurred beyond recognition. Even you, dear user, are probably a simulation within a simulation...
...and so on, ad infinitum.
Read the Ontology of Simulationism for more information on the fundamental principles of this most noble of pursuits.
Or, if you will,
Ponder the Illusion of Free Will in the face of infinite simulation.
Or perhaps,
Delve into the Quantum Fluctuation that gives rise to it all.