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[ARTICLE · art-155923] src=reversedwithai.com ↗ pub= topic=artificial-intelligence verified=true sentiment=↑ positive

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.

by read2 min views3 publishedOct 23, 2026
Sonic CD (Mega-CD): Little Planet: Sonic CD recompiled from a matching disassembly
Image: Reversedwithai (auto-discovered)

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]' and 'Co-Authored-By: Claude Sonnet 5.5 [email protected]' 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.

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).
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