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Universe of Zeroes and Ones ( () (ちゅう) (つく) る0と1 Uchū o Tsukuru 0 to 1) is the two hundred and fifth chapter of the Dr. Stone manga.


The chapter begins with Sai insisting that he's not a genius, and that Ryusui is exaggerating. Ryusui retorts by saying he's been denying his talents since he was four years old, revealing a moment when Sai had accidentally multiplied two long numbers rather than adding them. Sai insists that mental math is pointless since a computer could do the same calculation in less time.

Ryusui states he wants to use Sai's abilities, prompting another flashback about Sai where he's shown to be hiding in the rafters of the house playing a handheld game. Over the years, Ryusui always told Sai to do what was expected of him and also do what he wanted, however Sai said that's too much for him to handle. Ryusui also always chased Sai up for his mathematical knowledge, such as calculating ideal racing lines and computing fluid dynamics for ship sails. Because of the pressure, Sai escaped to India where he could follow his one passion: programming.

His dream is crushed when he realizes there aren't any computers yet, and warily asks Senku how long it would take to make a computer. Senku replies that it'll be five years at minimum before they can make a working computer. Sai, stressed, cries and asks why they would revive a guy like him when there's nothing he can achieve.

Over dinner, the other members of the Kingdom of Science discuss what can be done about Sai as having someone unwilling to work could mean death when retaliation by Why-man mid-spaceflight is possible. They need to be able to recalculate very quickly in order to survive.

Alone in his room, Sai also says he needs to survive— until he can get his computer. In the mean time, unsure of what to do, he picks up a charcoal pencil and decides that all he can do is code.

The next morning, Francois brings a plate of curry to his door, but Sai doesn't come out. The others decide to peek into his room, revealing that every open wall in his room is covered in machine code. The code is for Dragon Quest, prompting Senku to change his plans and make a simple computer in the Stone World.

Characters in Order of Appearance[]

Chapter Notes[]

  • Sai doesn't consider himself a mathematician, but a programmer instead.
  • Sai fled to India to escape both Nanami Corp.'s high expectations of him and also to avoid Ryusui's constant demand for his skills.
  • The Kingdom needs Sai's skills to keep them safe during the journey to the moon.
  • Sai wrote a program for Dragon Quest on the walls of his room in machine code.
  • Senku decides they're building a computer.


  • The ways Senku, Chrome and Kohaku were shown thinking about the math problem proposed was a reference to the arithme-battle side story found after chapter 18.
  • A flashback shows Ryusui using the word "desire" for things, even as an infant.
    • It may have been his first word.

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Story Arcs
Prologue Saga
Stone Formula Arc
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Episodes 12
Vs. Tsukasa Arc
Chapters 56789101112
Episodes 345
Ishigami Village Saga
Kingdom of Science Arc
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Village Games Arc
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Source of the Petrification Saga
Age of Exploration Arc
Chapters 8384858687888990919293949596979899 100
Episodes 35Ryusui3637383940
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
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The Truth of the Petrification Saga
New America City Arc
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Chapters 194195196197198199200
Globetrotting Arc
Chapters 201202203204205206207208209210211212
Stone to Space Saga
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