Unless there's some serious glitchery going on on my PC, it seems that this is just 25 clones of Aie Mak Sicur.
No story, and Aie Mak Sicur is a fun level, but playing the same level over and over gets old.
A 25 level solo scenario, seven years in the making, Marathon: W'rkncacnter explores the player's future after the final level of Marathon Infinity.
Although it uses standard Marathon Infinity shapes, monsters, and weapons, Marathon W'rkncacnter features stunning architecture and use of the cutting edge persistent Lua feature of Aleph One.
Coming soon: the Marathon: W'rkncacnter net map pack.
WARNING: There are story spoilers in the reviews! Don't read them if you don't want to be spoiled.