I've noticed that not a lot of people talk about Sonic Spinball, and barely any of it has been properly documented either. I've decided to take a look at Sonic Spinball and document anything I can find. I'll highlight the most important finds first. So first off, inside the Sonic Spinball August 1993 Prototype contains a screen from the group PREMIERE from the old BBS scene group, and inside of that it says that the prototype was supplied by Winston (who seems to have gotten quite a bit of the Sonic Prototypes from the BBS back in the early 1990s). This screen is located at 0x103400 in the ROM, and at 0x120000 is the start of 8kb EPROMs from a July Prototype of Sub-Terrania dumped by FAIRLIGHT. Huge thanks goes out to ValleyBell and their GEMS tools, their tools are amazing! While using their tools, I got to find that there are actually quite a few sounds and songs in this prototype that were never properly documented, such as the incomplete version of The Machine (which is ID 00 in GEMS). The disassembly can be found here. Now onto the content that is non-prototype. First of all, the disassembly on Sonic Retro is very outdated, and I don't recommend using it as it wasn't disassembled properly as stated in the readme. I am making a disassembly of my own, which is going to disassemble each version of the game. Most of what I disassembled in IDA Pro is mainly code pointing towards text and pausing the game, as well as some other routines I will look into later. Majority of the non-disassembled code is hard-coded in C, which will be fun to disassemble. Yet again, huge thanks to ValleyBell and their GEMS tools, as the drivers are fully split and disassembled now. I've also heard that there is two compression formats in Sonic Spinball, those being referred to as C1 (which is already cracked by drx) and C2 (not yet cracked). If you'd like to look into this disassembly, go here. Important Note: These disassemblies will take a lot of time to complete, and they probably will never be complete, these are mainly here for research purposes.