Unfinished Business, Both Acts v1.2
The first official submission of a map that requires Aleph One, the work-in-progress resulting from the M2 source code release. 8 levels, using several unfinished bits from the Orphanage as a base. Very impressive looking levels... the complexity would crash M2 or Infinity. Even in Aleph One, they can be quite slow in places. They look gorgeous, though. The Temple (big version) is not playable as a net level, but is one of the more complex levels I've seen. Run around in it, get ideas, build your own cool stuff. v1.2 fixes a few 'discrepancies', expands many outdoor areas. The temple, in particular, is more playable.
Levels in map "Unfinished Biz-Acts 1+2 (v1.2)":
LoMax Prison
Temple of Sun
Bunker's Entrance
Cold Heart Deux
Circular Reasoning
The Temple
Jjarring
The Temple Version 1