i just found this article about a guy writing about his life and the timeline of video games. here is a paragraph he wrote about poussinet: "There was this team of three programmers I met in a group reunion. They were once showing a game they had completed that is called POUSSINET. They made it on the good old Atari 8-bit computer. If I remember, POUSSINET was some sort of Super Mario Bros. type, where the player controls this little yellow bird in a maze that resembles some sort of automated factory. Too bad they only sold like 2 copies!" So he knew bruno and denis. Only 2 copies sold, so these prototypes and versions are some of the only ones in existance