Thread:Withersoul 235/@comment-30300307-20170727115013/@comment-32286613-20170728141210

Adamjensen2030 wrote: You can also upgrade Solaris, Illumina, etc ONLY by adding the Archie Key as well.

https://en.wikipedia.org/wiki/Dimension#Additional_dimensions this link should answer your questions. Extradimensional is at least 5D though I'm sure it's likely higher. Yes, it is higher. The Extra-Dimensions starts from the 6th dimension, and since Archie Sonic's multiverse was already infinite, Sigma is already High 2-A, so the extra dimension is Low 1-C