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powerlevels from Hirohiko Araki's point of view:

[Drawing Manga, Araki-Style Part (7): Like an RPG or Board Game]

At the time, the "pyramid (tournament) formula" (A would fight & defeat B, then fight stronger character C, and on and on) was all the craze in Shonen Jump. But, Araki wondered, how strong could they get? Wouldn't the entire system collapse as soon as you reached the top, much like the economic bubble of the 80's in Japan? It wasn't like there could be an infinite number of levels of strength. So, he decided to create an RPG/board game-style system where characters traveled to different places to fight enemies, as seen in Jojo Part 3, where the protagonists traveled across Egypt while battling enemies