Bonne Étoile: a role-playing game with an AI game master inside the iPhone

Where it started

I love isekai stories, where the hero is reborn in another world. And I wanted to test one question: what can the AI built into an iPhone do, with no internet?

Bonne Étoile is the answer: a humorous text role-playing game.

A world upside down

Your hero is reborn in Contresens, a world where logic runs backwards. You follow their whole life, from birth to the grand finale, across 10 chapters, about 4 hours of play.

• Three choices per scene, which matter later
• d20 dice, hit points and 5 stats
• Relationships with the characters, comedy style
• Death is not the end: you visit the Soul Counter and replay the scene

The improvising game master

This is the part I enjoy most. Besides the three choices, you can type a free action: "I compliment the guard", "I hide the key in my boot".

A game master powered by Apple Intelligence, the model that runs directly on the iPhone, improvises an answer in the tone of the story. It never breaks the script: it colors the scene, then the story carries on. If the model is not available on your device, the option simply disappears.

Writing a game like a book

The whole story is written in files, chapter by chapter, with a "bible" that sets the world, the characters and the limits. A small checker re-reads everything and estimates the play time.

No server, no account, no subscription: the whole game fits in the phone.