Winning huge/quick is pretty rough! Hmm...none of my early gambits worked so I tried a different game.
I won in 1934. I'm going to hang onto the saves...not sure if they'll be competitive but hell, it's my first gauntlet and this isn't gonna be super easy for anyone on quick

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Still...having to use TANKS? Hmmmmmmm.
Edit:
Agree on prats not necessarily being the answer here. The problem is that troops travel SO SLOWLY relative to tech. Everything takes longer - movement, healing, peace treaties, etc. Most obnoxious of all is the AI ability to produce more units as the war goes on relative to other speeds - fast wars are a priority here. At least the bonuses on Prince are pretty easy, but it's still not a walk in the park to try to go praetorians through a bunch of people. I know HOF disallows Inca by default but IMO they should be allowed for this just to laugh at people who try to actually use the UU (warrior rushes still work, but after that they tend to have metal)

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In my first attempt I put 18 civs in and I'm now not convinced that was a good idea. On that attempt I wound up fighting AIs with vassals, and the game seems a bit glitched in terms of those - AIs with vassals don't want to capitulate even if you're MURDERING them (taken 8 of 10 cities, 4x their combined power, for example). Putting 18 civs in meant putting in a couple civs with ibuildunitprob of 25. That may not have been the optimal metric regardless, maybe I should have selected AIs based on peaceweight, although honestly it's the stacks I don't want to deal with. Liz declared on me in that game and I killed a grand total of 1 chariot before taking peace.
Terra seems interesting but while you could get settlers over there REALLY fast with joao or even a plain astro bulb...in order to actually keep them you'd need state property after a couple (even with forbidden palace non-SP would be a bit rough). In theory you could colonize and just SPAM out settlers over there, but you'd have to conquer more on the homeland there.
I think I'll run another game and see if I can't beat 1934 :/.