Season 1

Gon and Killua learn many abilities from their new teacher, Biscuit Krueger, digging through mountains as training exercises.

Killua exits the game to re-take the hunter exam. He easily becomes a hunter in the first exam by knocking out all the other examinees. Gon still trains his abilities with Biscuit while Gensuru, the Bomber, destroys the player's alliance.

Gon and Killua start using their abilities to obtain cards, which they discover is easier due to Biscuit's training program.

Gon and Killua continue playing and have more than 50 cards (out of the 100 required to win the game). The Bomber and his team have 96 cards while a united front rises to prevent them from winning the game by monopolizing one of the cards they still need.

Gon, Killua and Biscuit go with the united team to find information about a card no player has been able to obtain. They find the location of the card, but fail to defeat the game master Razor and his Fifteen Devils in a series of sports related one-on-one contests. Gon, Killua, and Biscuit organize a stronger team to tackle the challenges, which includes Hisoka and Tsezguerra.

After the team is gathered, they easily pass the sport contests, but still must defeat Razor in an 8v8 game of deadly nen-charged dodgeball.

Gon uses his new abilities in the dodgeball game. Killua's hands are heavily injured. On Razor's team only he remains, facing Gon, Killua and Hisoka.

Gon's team wins and they get the card Razor was guarding. The game master tells Gon about Ging. Hisoka goes his own way.

A fight against the Bomber is imminent. Gon trains his timing, while Killua and Biscuit form a battle plan.

Gon has trained a lot and is prepared to fight. Meanwhile, Battera's secret lover has died and the reward for completing the game is canceled. The battle between Gon, Killua, and Biscuit against Gensuru and his comrades begins.

Killua and Biscuit win their fights. Gon fights Gensuru.

Gon is still fighting with Gensuru and loses one hand.

Gon wins against Gensuru and takes all his cards. They heal everyone, including Gon's severed hand, and reach a total of 99 cards. An island wide quiz event for the last card is announced.

Everybody in Greed Island participates in a quiz. Gon scores the highest with 87 correct out of 100 questions, wins card #00, and gets instructions to go to Greed Island Castle. There he meets 2 other game masters who give him his reward, a small binder which can be used to take three Greed Island cards out into the "real" world. With Killua and Biscuit they finish the game and leave Greed Island. Once outside Gon and Killua use the card Accompany to fly to the player with the codename "Nigg," which Gon believes is an alias of his father, Ging.