Touhou Gouyoku Ibun: Sunken Fossil World

Touhou Gouyoku Ibun: Sunken Fossil World is the 17.5th installment of the Touhou Project, created by Team Shanghai Alice, with Twilight Frontier's collaboration. The game is described as a "horizontal side-scrolling danmaku water action game" on the official website.
- Genres: Fighting, Hack and slash/Beat 'em up, Adventure, Indie
- Released: 2021-10-24
- Platforms: PC (Microsoft Windows), Nintendo Switch
- Series: Touhou Project
- On: Steam
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