Btw, did you liked the "Mechanized" challenge? Basically, steamroll of Centurions.
that has been done before, but it did not end well...
Can you descibe that more detally? From my perspective, Centurions do not replace all units, as you read the description (I will not tell twice the same thing cx). Also, they can come as "reinforcments" from the corner of the map, like super apocs, or like Epsilon air armada in Ascension, not by production. And addttional 3 centurions are regular AI centurions, with Yunru exeption (since i do not imagine 3 clones of Yunru).
Another forces in general: terror drone waves (wich, without proper care, can end your economy and units, infantry specially), chineese cyborgs/other heavy infantry as replacement of regular ones. And, maybe, "early versions" of Foehn vehicles, as seen in Tread Of Dread and other (wich feturing Gharial). And, of course, heavy vehicles as nuwa cannons, and probably something heavy too.
The centurion "reinforcments" can come-out from central factory building (not mistaken with war factory), wich heavyly defended from Air by grumbles. And, a lot of Grumbles. So, that will deny early aviation rush at factory to stop centurions from appearing. Maybe thell have they own "team AI", colored different from the main enemies. Also, the cyborgs in centurions and just regullar attacks will basically deny any infantry (exept some heroes), not mention Grumble blocade.
The only solution left - use anti armor/anti-tank. I thinked about this idea really good, so, i can pretty much answer the most of the challenge questions.
