Calibre, a widely used digital library manager, has released version 9.15, which includes a unique narrative adventure game powered by artificial intelligence (AI). This feature is not immediately visible upon updating; users must manually activate it by adjusting settings in the Preferences menu. Once enabled, the game allows users to create their own story worlds, complete with settings, characters, and a dynamic plot that unfolds turn by turn. Each session is saved as an EPUB file, a standard format for e-books, which can be read on e-readers or shared with others. The game was initially developed as a testing environment for the AI systems used in Calibre. Kovid Goyal, the software’s creator, describes it as a fun feature that users can now enjoy. Once activated, users can either choose from 11 pre-defined genres—such as fantasy, cyberpunk, or western—or craft their own world. For instance, a user might set the scene in an office building in La Défense in 2031, where a rogue maintenance AI prevents employees from leaving after 6 PM. The AI then generates a detailed narrative, complete with game mechanics, characters, and even editable options for the player to influence the story. To use the game, users must connect an AI model to Calibre. The software supports several AI platforms, including Anthropic, Google, and OpenRouter, which require an API key. Alternatively, users can run AI models locally on their own machines using Ollama or LM Studio. This setup allows for more control and privacy but requires additional setup. Testing with a model called Qwen on a Mac M4 showed that each turn of the game took about a minute to generate 450 words of text. On less powerful hardware, this could lead to longer wait times or a less seamless experience. One notable limitation is that the AI responds in English, even if the user describes the world in French. This is because the instructions sent to the AI are not translated. Users can either play in English or explicitly request the story to be in French during the initial setup. Additionally, the game includes a "Read" button that allows users to export their adventure as an EPUB file, complete with a cover and chapters, ready for reading on any e-reader. While the AI-powered feature has sparked some debate among users, it remains available for download on calibre-ebook.com, with specific instructions for Linux users to use the official repositories for the latest version.