Скачать или смотреть 9 Kings - Beating all Kings in a Row Without Perks on King Difficulty

This took 10-20 attempts, most died on the 1st or 2nd or 3rd King. Two attempts made it about halfway before dying. Much less consistent than IX IX winstreak. Accidentally disabled audio for this streak.

Not sure about the order of kings, but I think Greed is the strongest (having extra gold generation makes them very very consistent).

As for the weakest ones, Stone has an issue where you just might not get any walls. Blood has an issue where you can start with a Bomber or Demon Altar and then have trouble actually setting up proper troops. Or sometimes you can start with proper troops and cemeteries but can't find a Demon Altar fast enough. Progress is quite reliant on enemy kings. Defenders really want Nature for Procreate/Poison Vial/Forest. Executioners are really squishy so even if you get Swords/Static, they often just get ran over by rebellion. Rats are very very slow to set up.

My tentative ranking, unsorted within rows, from strong to weak, is probably:
Greed
Nothing, Nomad, Nature
Spell, Time
Stone, Progress, Blood

Strategy wise there is not too much to say, it will depend massively on what cards you get and what enemy kings you fight. But generally a common thing is you usually need to transition to a wall build if you fight Stone, as otherwise their Ballistas will destroy your army. Exceptions being Kings like Blood, Greed, Nomad, etc, who don't need to use a wall build or can't. Some Kings are quite good or even better in some aspects with a wall build anyways, depending on their cards and base, though some are a lot weaker. However, you need to actually roll the walls which can be quite hard, and you need a way to keep getting walls (ideally not from only Stone) or to regress and level them, or you will lose.