I'm also very suspicious of the fact that the referees did not give the players the opportunity to shuffle the 10 cards: they already stacked them on the table and told the players to draw cards from the top one by one. That means the two hands may have been pre-determined, the only unknown...
It took me about 45 minutes to do the calculations and grasp the rules and their implications, I have no idea how Kaji managed to figure it out so quickly.
Calculating all of this nonsense in your head while you're underwater will make you consume a metric tonne of air. I'm guessing that's...
I think the words "Usogui's nightmare" are shown after he's already woken up, which might mean that his "nightmare" is the situation that's already happening right now, in real life.
I'm guessing it's implied that players with levels 80 and above will be split as evenly as possible between the three kingdoms? Otherwise, what would happen if a Kingdom simply didn't have any 80+ players?