OpenPuff is a tool, I know THAT much 😁 My interest is more about the concept of stego, and methods that are simple enough to use with simple programs - like Gimp, over even Paint when it's about image steganography - and even by hand or any text editor for text stego. To make a secret message almost impossible to find (unless you know how, obviously) using only pen and paper, in a way that doesn't reveal there's a hidden message at all - that's very satisfying 😊
RE: Puzzle SOLVED !