Brain-Battle Puzzle Pieces (頭脳戦のパズルピース Zunō-sen no Pazurupīsu) is the 122nd chapter of the Dr. Stone manga.


In the hidden cave within the Petrification Kingdom, the Kingdom of Science revives Yuzuriha, Chrome, and Ukyo. Amaryllis soon arrives, having seen Kohaku and Ginro's petrification. She reveals the secret of the kingdom: their master's been petrified and appears to be related to Soyuz.

With the knowledge they have in hand, the Five Commanders try to piece together the situation. They deduce that the Petrification Kingdom must only have a single Petrification Weapon and that Kirisame isn't privy to the kingdom's secret.

Mozu appears, having followed Amaryllis. Taiju attempts to defend the others, but is easily outmatched. However, the Commanders deduce that Mozu must not be directly working with Minister Ibara. Gen steps up, aiming to convince Mozu to join forces with the Kingdom of Science.

Characters in Order of Appearance

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Arcs & Sagas
Prologue Saga
Stone Formula Arc
Chapters 1234
Episodes 12
Vs. Tsukasa Arc
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Ishigami Village Saga
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Source of the Petrification Saga
Age of Exploration Arc
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Treasure Island Arc
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The Truth of the Petrification Saga
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