Old One (旧王) is the tenth episode of the Darwin's Game anime.
- As the anime cuts Ayanokouji Kaito and Tagonaka Yukimasa's appearances, their dialogue about Wang's video is given to Ryuuji.
- The anime shows the Sunset Raven's strategy meeting which was skipped over in the manga.
- Several scenes are removed, such as Youta's flashback and Kaito and Yukimasa meeting with the Sunset Ravens.
- Rein and Sui have an anime original scene.
- Kaname's scene at the end is expanded by having him recall the deaths of Hiroyuki, Hamada, and Ichirou, in addition to showing butterflies representing other deceased people.