Hunter x Hunter: Greed Island - An Isekai Within a Shonen

gamerant.com:

Gon is a young child with a lot of strength and even more determination. He uses this determination to acquire a nearly impossible-to-get game. Once he and his friend Killua start playing however they are sucked into another world entirely. One where they must acquire cards and train their strengths to even greater heights. However, this deviation from the main plot of the story takes what was previously a shonen anime and edges it much closer to the isekai genre. There is still plenty of fighting, plenty of friendship, and plenty of puzzles for the boys to solve, but the introduction of an isekai element was a bold and wonderfully executed move.

Hunter x Hunter follows the story of Gon Freecss as he seeks to reconnect with his lost/absent father. Along the way he learns that his dad was one of the creators of a mysterious game called Greed Island. He and Killua dedicate themselves to acquiring a copy, and once inside, they dedicate themselves to beating the game in the hopes that they will learn something about Ging Freecss.

Aggretsuko: Why Some Shows Grow Darker With Time

Greed Island was an extremely exclusive game released only to hunters. There were only 100 copies made and with a nearly 6 billion dollar price tag. In order to enter the game one must be able to utilize Nen, a magic-like skill that is a requirement of the secret hunter exam. By the time Gon and Killua are able to acquire the game no one had yet beaten the game, and therefore many urban myths exist about the results of the endgame.

Once a player begins the game they are transported into the game, in realityto a remote island. If they die within the game they die in real life, but they are able to leave the game voluntarily or by winning it. All players in