1. like
@QuasiYuri at least 3-A, likely High 3-A, and depend on context and feat itself
2. in term of math, infinitely above 3D is still infinite 3D, which is High 3-A, 4D require uncountable infinite superior
3. Drive people insane is either hax, or those are people limit, incapable of containing that amount of knowledge/informations