Hi,

It's not playable. The most you can do is try to analyze the data. There are graphics viewers for Megadrive and I wrote a Spinball decompressor (for some of the data there) a few years back.

*MAYBE* someone could make it playable. There are odd bytes of the first big block of data, which contains most of the code. If someone analyzed the odd bytes and compared them to the final, maybe they could reconstruct working code out of it... I'd try that but I'm very busy :/

It's different than any released Spinball proto/final, I checked that, but I'm not sure how different it is, it's hard to tell.