Not sure why it wasn't posted here, but yesterday SegaSaturno released this game:

http://www.rapidspread.com/file.jsp?id=hjhwjuigoh

Not sure why there are different sizes of the same data inside, but there you go. 

There's A TON of raw source code and other unidentifiable things in the rom as well. You can see that stuff here:

http://forums.sonicretro.org/index.php?showtopic=19503&amp;view=findpost&amp;p=413666

Neat! Can't wait to see what's next. :)