Sonic CD (Mega-CD): Little Planet: Sonic CD recompiled from a matching disassembly

A project called Little Planet has recompiled Sonic CD from a byte-identical disassembly of the Mega-CD game, using a static recompiler to translate 68000 assembly into C, with commit metadata crediting "Co-Authored-By: Claude Opus 5.5" and "Co-Authored-By: Claude Sonnet 5.5" as co-authors on tasks including audio driver handling and widescreen menu adjustments. The port implements Mega-CD hardware — 68000 CPUs, Z80, VDP and audio chips — via high-level emulation replacing the original BIOS, and adds True16:9 widescreen, a 4K 60 fps remastered opening and CRT filters. The README names the Japanese release (G-6021, SHA-1 5b0ac16233028bcd8691c71b0a749b8d485dae7c) as the primary tested version, requires users to supply their own disc image, and reports no independent confirmation of the result.

Evidence at a glance Based on the linked sources. The author's reported result and independent confirmation are separate checks. - AI involvement - Reported models: Claude. Tools: SDL3, FFmpeg, Python 3. The writeup below describes the work attributed to AI. - Reported result - Works. This is the directory's source-based outcome classification. - Independent confirmation - Not reported. - Human work and limitations - The project uses a static recompiler to turn 68000 assembly into C. The commit logs explicitly credit AI models as co-authors for specific implementation tasks, such as audio driver handling and widescreen menu adjustments. Original sources What was done Little Planet is a Sonic CD port built from a byte-identical disassembly and static recompiler. It features True16:9 widescreen, a remastered opening, and high-level HLE implementation of Mega-CD hardware, requiring a user-provided disc image. Little Planet is a Sonic CD recompilation project that provides a disassembly of the game's code, which reassembles byte-identical to the original disc. A static recompiler translates this code into C, which is then executed and verified frame-by-frame against an interpreter. The project implements the Mega-CD hardware, including the 68000 CPUs, Z80, VDP, and audio chips, using a high-level implementation HLE to replace the original BIOS. The README documents that the Japanese release G-6021, SHA-1 5b0ac16233028bcd8691c71b0a749b8d485dae7c is the primary tested version, while others may boot but remain untested. Development commits in the project repository include the strings 'Co-Authored-By: Claude Opus 5.5 \ email protected\ https://reversedwithai.com/cdn-cgi/l/email-protection 6f01001d0a1f03162f0e011b071d001f060c410c0002 ' and 'Co-Authored-By: Claude Sonnet 5.5 \ email protected\ https://reversedwithai.com/cdn-cgi/l/email-protection 4c22233e293c20350c2d2238243e233c252f622f2321 ' in their metadata. The port supports True16:9 widescreen, a 4K 60 fps remastered opening, and various CRT filters. Users must provide their own disc image, as no game data is included. The project is available at https://raw.githubusercontent.com/carlosrmz009/littleplanet/HEAD/README.md https://raw.githubusercontent.com/carlosrmz009/littleplanet/HEAD/README.md . Reproduce it Build the project using the provided scripts build linux.sh, build mac.sh, or build.bat and run the resulting binary with a path to a valid Sonic CD disc image e.g., ./build/littleplanet path/to/sonic.cue .