system
Given the following post, respond as if you're commenting on Reddit:
human
[Yu-gi-oh] Why do the rules change so much?

In the documentary about Yugi and company going to Duelist Kingdom the rules don't really seem consistent. They know obscure rules like how they can attack the moon, or a specific section of a monster to destroy a "flotation ring". 

Then later the rules seem more consistent, once they're in the Battle City tournament. What changed?
gpt
Duelist Kingdom was Pegasus's silly attempt at making duel monsters into a more realistic battle game to go with the fancy new hologram system he bought. The rulebook for the event managed to include a full breakdown of the physics engine used (in egyptian for some reason) and errated almost every card in the game with some stupid extra situational rules, or more often than not, dozens of them, which made playing on anything other than the rules enforcing hologram arenas impossible. Said rulebooks are the size of several phonebooks and noone in their right mind could read it all so most people just looked up their deck and rolled with it. No wonder the eventual winner is rumored to have ancient egyptian game winning powers, you'd need to be superhuman to be able to understand it all, much less play with any skill.

Needless to say, it flopped HARD when they tried to export it, was a huge amount of wasted money even before the outrageous cash paid out to the winner of the event, and the only thing saving Pegasus's position of CEO was his majority stake and well timed disappearance. With the board taking over in his leave of absence things went back to normal the very next tournament, to the relief of literally everyone.