Not to be confused with Miiverse.
The Milliverse is extremely big! Its size is 600 quattortrigintillion light years. Can you imagine it?
There are actually two different kinds of verses both called the Milliverse, which are the definition above and verses in the Omniversal Set. The latter definition is this: Its dimensionality is the same as that of the Universe, and its size 10^30 light years. K 8.0 civilizations and higher can exit it.