Reality

Reality is the physical space of everything. It is made up of at least 2 (there could be more) layers, and a group of layers called the Multiverse. It was created 13.7 billion years ago by an unknown force and will exist until heat death occurs in the Multiverse. Everything here follows the same laws of physics. There could be other realities with different laws, but it is unknown how to get there, if they even exist.

Multiverse
The Multiverse, a group of layers, houses all the universes. There is a finite amount of them, and they are created by SBURB Games. Each universe is the same size, and all of them are expanding at the same rate. Every universe sits in the exact same location as all the others, but things in one universe can only interact and see things of that universe, so its impossible to interact or see all the other.

Time passes at the same rate in all universes, and the first one was created in -13,795,017,202 CE. Some universes use different time systems, so thats why you may see one where the year is 3000 even though tis actually the year 1000000 in the first universe. When a new universe is created, it starts at the current time in the first universe. For example, if it was 300000 in the first universe, the new universe would appear in 300000, as if it had always been there since -13,795,017,202, but in reality it has only been there since 300000.

It is unknown who or what created the first universe and why/how.

Underworld and Void
Different from the Multiverse, the Underworld and Void are infinite. The Multiverse exists as a certain spot in the center of both of them. See main articles for more info.