> I vaguely remember L'œil Noir as a classic among "Livres dont vous êtes le héros".

Oh yup I read/played those books too! The earliest one you could find the end by going, literally, to the last page of the book. Then at some point they changed that and you couldn't cheat anymore for the end was "hidden" at some random place on the book!

Thanks for reminding me about those (Cthulu I remember too!).