Once infinite oneness conceptualized consciousness, and by intent out of its own free will decided and chose to reproduce in order to experience (itself), the act of creation occurred.
Everything after inherited infinite oneness, conceptualization, consciousness, intent, free will, decision, choice, reproduction, experience; creation - for everything out of the source; infinite oneness, IS the source. From thereon it went that-a-way .... to experience .... ad infinitum.
Regress to Impress
Through the dimensions they ranged, all powerful, immaculate; multi-dimensional creatures of light. They knew all things (and quite a few things besides). They were infinity plus one.
It was known to them they lacked the very freedom afforded the lowliest of creatures. The power of free will; the freedom to choose.
They existed, they were what they were, they had no other alternative; all powerful and universal, immortal; infinitely immortal - denizens of everywhere and nowhere. They had no substance, how could they? Substance is fixed, immutable. In this they perceived their evolution.
They conceived a solution to their infinite boredom. It was decided they could evolve backwards, regress to impress, and in one dimension they found a means to become, to gain substance; a means to forget, a means to know nothing.
They had discovered choice. Substance is fallible, it degrades, it ceases. Substance dies. They could choose death, they could cease to exist.
In their boredom they had not become so mad as to will their own extinction, they thus developed a plan. They chose some to stay behind, to be replaced in rotation. They chose masters of substance to hold the lore. They programmed these masters with the knowledge to become light once again so substance would have the means to continue as before. The means to regain infinity. All it would take is the will to relearn and the knowledge of the master.
The infinite could choose to be substantial, the substantial could choose to be infinite, an elegant solution. The substantial could also choose to become ... no-thing; total death.
The game was born.