Disassemblies

Sonic 1

• File:Sonic 1 (IDA Format by drx).zip - The very first Sonic 1 disassembly, by drx. This is in IDA format and can only be opened in IDAPro
• File:Sonic 1 (Text Format by drx).zip - The very first Sonic 1 disassembly, by drx. This is in text format and can be opened in any editor. It targets SNASM68k
• File:Sonic 1 (Split and Text by Hivebrain).zip - The June 2005 release of Hivebrain's Sonic 1 split disassembly. Very well labeled and highly recommended. SonED2 project files are available here. It targets SNASM68k

Sonic 2 (including prototypes)

• File:Sonic 2 Early Prototype (IDA Format by drx).zip - A disassembly of the Sonic the Hedgehog 2 Nick Arcade Prototype, by drx. This is in IDA format and can only be opened in IDAPro
• File:Sonic 2 Early prototype (Text Format by drx).zip - A disassembly of the Sonic the Hedgehog 2 Nick Arcade Prototype, by drx. This is in text format and can be opened in any editor. It targets SNASM68k.
• File:Sonic 2 Beta (Split Format by Esrael).zip - A disassembly of the Sonic 2 Simon Wai Prototype, by Esrael
• File:Sonic 2 Rev 00 (Text Format by drx).zip - A disassembly of Sonic the Hedgehog 2 revision 00, by drx. It targets SNASM68k
• File:Sonic 2 (IDA Format by drx).zip - A disassembly of Sonic the Hedgehog 2, by drx. This is in IDA format and can only be opened in IDAPro
• File:Sonic 2 (Text Format by Nemesis).zip - A disassembly of Sonic the Hedgehog 2, by Nemesis. This is in text format and can be opened in any editor. It targets SNASM68k
• File:Sonic 2 (Split Format by Nemesis).zip - Nemesis's Sonic 2 split disassembly, targeting SNASM68k. This disassembly is rather slow to rebuild due to the use of an external program (combine.exe) to insert binary files into the ROM
• File:Sonic 2 (Text Format with Incbin by shobiz).zip - A drop-in replacement for the s2.asm file in Nemesis' Sonic 2 split disassembly, by shobiz. This disassembly uses incbins to greatly speed up compile times. It is also fully SonED2 compatible without requiring any modifications. This disassembly targets SNASM68k and works on Windows 2000/XP.
• File:Sonic 2 (Text Format with Incbin by Xenowhirl).zip - Identical to shobiz's modified disassembly, but works on Windows 95/98/ME/NT as well as DOSBox. It does not work on Windows 2000 or XP due to a difference in the way these operating systems handle 8.3 short filenames
• File:S2dasm.zip - The 2006 release of the disassembly of Sonic the Hedgehog 2, by Aurochs. It is better labeled than Nemesis' disassembly and the compile times are much faster. While the disassembly itself is fully SonED2 compatible, project files are not publicly available. It targets the Macro Assembler AS, and is cross-platform. Highly recommended. This disassembly has three small bugs - this post lists the bugfixes

Sonic and Knuckles

• File:Sonic & Knuckles (IDA Format by Stealth).rar - The first complete Sonic and Knuckles disassembly, by Stealth. Includes support for Sonic 3 lock-on. This is in IDA format and can only be opened in IDAPro
• File:Sonic & Knuckles (Text Format by Pu7o).zip - A text file exported by Puto from Stealth's Sonic and Knuckles disassembly for those who do not have IDAPro

Sonic Crackers

• File:Sonic Crackers (IDA Format by Stealth).zip - A Sonic Crackers disassembly by Stealth. This is in IDA format and can only be opened in IDAPro