Mysterious Immortal - Fox Tail's Pen Genuine Authorized Edition is an iPhone game under the Games category, developed by Shenzhen yuyou Technology Company Limited. This free game offers an immersive experience based on licensed content from Yuewen. Players can enjoy the game without the need for in-app purchases. The game, created by a small studio with limited resources, promises to evolve towards higher production values with financial success.

This game features a gameplay style centered around text, recreating the eerie atmosphere of Mysterious Immortal, providing players with a world of folklore Lovecraftian horror. Additionally, it incorporates puzzle-solving elements and other play styles, aiming to authentically capture the essence of the original novel.