Lately you hear more and more talk of master disk, gold source code. As you have already noticed retrogame is coming back really fashionable, so it's a few hours ago the news of the release of a prototype of Rayman to SNES. (Link to article bottom)
The cartridge was shown in a tweet months ago by Michel Ancel accompanied by some screenshot.
In short, following THIS LINK and using an emulator for SNES you will have the chance to play a static level and no enemies / sorts.
But hey, is still the embryo of one of the most affirmative sages, we talk about video gambling archeology!