If you dump Matra's Ink, and run it on an emulator, it loops back to stage 1 after finishing stage 2. This is probably due to some kind of anti piracy protection, since it works fine with blueMSX+game reader. Has anyone looked into it further? Or is discussion of reverse engineering Ink considered a taboo?

Ok, I managed to find the check, and circumvent it by hacking the ROM dump a bit. How it exactly works internally is still unknown to me though. (yeah, this post lacks details, I don't want to say more until the taboobies are gone)