One Piece Knowledge King

One Piece Knowledge King Deciding Battle is an annual examination event hosted by Shueisha and Eiichiro Oda where fans can test their knowledge of the One Piece manga.

Information
The online exam consists of 100 questions from four genres: story, character, techniques, and culture. The exam is one hour long, and participants who score 90 points or more in the 100 regular questions will be given 50 additional, more difficult questions that must be answered in 30 seconds each and will stop once participants answer three incorrectly.

Questions will draw from One Piece Volumes and Vivre Card - One Piece Visual Dictionary. There are four types of questions:
 * One answer per question: a question where participants select one answer from four options
 * Multiple answer questions: a question where participants choose more than one correct answer from four options
 * Sorting: a question where participants put four items in the correct order in a list
 * Free answer: a question where participants are asked to write out an answer

After taking the exam, fans will receive a report card that analyzes their exam results.

2019
Registration for the 1st Knowledge King Deciding Battle ran from August 2 to October 5, 2019. On October 6 at 13:00, the initial online competition was held, consisting of 100 questions to be answered within an hour. Those who had at least 90 correct answers were allowed to participate in the second round, consisting of 50 questions with 30 seconds to answer each question.

The 10 highest scoring people who participated in the second round were invited to the Deciding Battle, which took place at Jump Festa 2020, on December 21 and 22, 2019. At the Deciding Battle, the 10 participants were split into two groups of 5, both of which had to answer a set of 5 questions; the winners from the two groups were then asked a set of 15 questions, with the winner being the first to answer 3 questions correctly.

Questions drew from Volumes 1 to 94.

The winner of the first Knowledge King Deciding Battle was Ryota. The exam is now referred to as Knowledge King Ryota (ナレッジキングリョウタ) after its winner.

In 2019 the prize for winning One Piece Knowledge King was a golden statue of Luffy. Ryota asked Eiichiro Oda to draw a signed, colored, drawing of Charlotte Katakuri.

The 1st Knowledge King Deciding Battle has been made available for anyone to take on the official website, as well as being included in the One Piece 500 Quiz Book 3.

2020
The pre-registration phase of the 2nd Knowledge King Deciding Battle ran from July 20, 2020 to October 24, 2020. The Deciding Battle exam took place on October 25 at 19:00.

Questions drew from Volumes 1 to 97.

The winner received a trophy, but its design differed from the 2019 statue. The top ten participants, as well as the top eleven participants from the first competition, would be invited to Jump Festa 2021 to participate in the Final Stage Summit War (ファイナルステージ頂上戦争) to decide the official Knowledge King (ナレッジキング).

Participants under the junior high school level were separated into their own ranking, and the top ten among them will each receive a prize.

Because Jump Festa 2021 was converted into a virtual event, the 2nd ONE PIECE Knowledge King Final Battle: Competition Edition (第２回ONE PIECE ナレッジキング決定戦・完全版) was broadcasted in two parts on YouTube on January 25 and February 1, 2021. The finals took place in a studio instead of taking place at a live event. The competition was hosted by MC and comedian Hidetsugu Shibata, his assistant Suzuki Yuri, and One Piece's current editor Takano. All three wore face shield due to the coronavirus pandemic. Last year's winner, Ryota, appeared with a red One Piece flag with Luffy one it before the start of the competition.

For the competition, competitors were broken up into groups of four or five, either A Block, B Block, or C Block, and each sat at podium where they would have to write their answers on small whiteboards. The winner from each Block continued to the finals.

A Block featured Nosuke Yoseii, Ryuichi, Koya-Ta.D.Ace, and Jinbe. B Block featured Poneglyph ARIMO, Orgis, Kiri, and Doratsuri. C Block featured Izuna, Ryota, Shohei, Yama-san, and Toy. Nosuke Yoseii, Kiri, and Yama-san won their respective Blocks and advanced to the finals. Kiri defeated the other two finalists and was crowned the new Knowledge King. He was given the One Piece flag during the Jump Super Stage event of Jump Festa 2021 Online, where the junior high school level finals took place.

2021
The pre-registration phase of the 3rd Knowledge King Deciding Battle ran from July 19th to October 23rd, 2021, and the online competition took place the following day at 19:00.

Questions drew from Volumes 1 to 100 and the Vivre Card databook.

The top ten contestants were invited to participate in the Knowledge King Decisive Battle "Summit War" (ナレッジキング決定戦"頂上戦争") at Jump Festa 2022.

Ultimately, Nosuke Kaisendon-san (のすけ海鮮丼さん) (the second-place winner of the previous tournament) was crowned the new Knowledge King. He requested a drawing of Monkey D. Luffy as a child.

2022
The pre-registration phase of the 4th Knowledge King Deciding Battle ran from August 8th to October 15th, 2022, and the online competition took place the following day at 19:00.

Questions drew from Volumes 1 to 103 and the Vivre Card databook.

The top ten contestants were invited to participate in the Knowledge King Decisive Battle "Summit War" (ナレッジキング決定戦"頂上戦争") at Jump Festa 2023.

Ultimately, Yama-san (邪馬さん) was crowned the new Knowledge King. He requested a drawing Nami with the Goro Goro no Mi, based on SBS Volume 98.

2023
The pre-registration phase of the 5th Knowledge King Deciding Battle ran until October 7th, 2023, and the online competition took place the following day at 19:00.

Questions drew from Volumes 1 to 106 and the Vivre Card databook.

The top ten contestants, as well as last year's victor Yama-san, the winner of the U18 quiz, and the winner of the U15 quiz, were invited to participate in the Knowledge King Decisive Battle "Summit War" (ナレッジキング決定戦"頂上戦争") at Jump Festa 2024.

After the initial competition, the four finalists were Meme (めめ), Kiri, Ryuichi (リューイチ), and Tatsuya (たつや), who were called the Four Emperors of Knowledge (知識の四皇). Ultimately, Kiri won, becoming the first person to become Knowledge King twice.