Hex reveals the number and look deeper.
I doubt its steganography with these kind of images, there would be too much distortion.
Audio files wont be directly accessible, exe, so I doubt it again
I think its gonna be more surface wise than that. A missing connection between games that is word based, or number based
HxD shows the message at the end of the solution.png if your wandering what I mean, look at older posts for the message, with look deeper and the number