I will just leave screen from my last game(Huge,Continents,Immortal,18 players):
Sweden here are top, leader in tech(beats me(Venice) for 8 techs) and all other beated by 12-14 techs. They have almost all wonders(I attach second screen) starting from medieval era, and they build(not conquer) them. All other wonders(ancient and classical), except few, are owned by Arabia. As I understand, Sweden just become a tech leader in medieval and there was no a possibility to anyone to build something.
They just capture Byzantium's capital(I don't know when, maybe in medieval) with +15 to science, +1 to science,faith,gold pantheon and universities +5 ))
This is almost end of game, only in end of game me and all AI were able to make such unhappiness to them. Just let them capture all CS/capitals /citiesthat cannot be raised(but some cities that can be raised they didn't even after -100 unhappiness).
But Nuclear Non Profilation(but after we adopt it, my one city was already dead due to nukes(I was only researching bomb shelters tech), Spaceflight Regulators - and Sweden cant do anything to Culture(even I with my Authority/Fealty/Impea Industry/Order Venice)
Even different ideologies and travel ban(that was adopted to stop Sweden tourism, not mine. All AI vote yeas for travel ban, as soon as Swedish people research flight)
And this was most hard game for last 2 month, such top Swedish that has all strategic monopolies, 40+ cities, leader in culture(they even beat me and Casimir in policies), they first take ideology, much earlier then everyone else.
If Swedish will stop to conquer - they will win(they lost due to boredom and fight against Venice in ocean with -20% to CS from unhappines), cause I haven't anything to increase tourism, only a few great works, and bonus 25% to GP from order. But this game was perfect.
Also a little word about unit cup: with no wonders for cup, only authority brunch+citadels - I was able to maintain all units I need starting from medieval era. But I was always in DP with my neighbours, so I never fight on 2 fronts(but always was ready, 30% of army always were in reserve + all garrisons)