Case study

memory of alessa: an in-progress Silent Hill 3 PS2 matching decompilation

Decompiles the PS2 executable and 40 overlays of Silent Hill 3 (NTSC-U v1.02) into C for Metrowerks CodeWarrior, and works alongside on the Silent Hill 2 engine, whose debug symbols from a 2001 prototype supply original names for shared code. Builds link with generated assembly for unmatched functions and are checked by SHA-256 against committed hashes. The README calls the project early-stage; decomp.dev reports about 9% of Silent Hill 3 functions and 58% of Silent Hill 2 functions matched at the pinned commit.

Targets: Game
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-10-19
Evidence class: C2 code & docs, no demo or download

Stars: 169
Last commit: 2026-11-10
Language: C
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

Observed: Code and documentation observed; no download method or demo found.
Checked: 2026-11-09

How evidence classes are assigned

Requirements & limits

Targets Silent Hill 3 NTSC-U v1.02 (SLUS_206.22) and the Silent Hill 2 engine from the 0.10 VW047-U1 prototype. Builds use assembly for unmatched functions; the project reports 718/8,002 and 2,530/4,371 functions matched respectively.
Supply the Silent Hill 3 SLUS_206.22 executable and B0.MFA archive; the optional Silent Hill 2 build needs prototype SLUS_202.28 and its overlays.
Hosts are x86-64 Linux, Apple Silicon macOS or Windows through WSL, with Python 3, wget and build tools. make downloads CodeWarrior PS2 3.0.3 for Silent Hill 3 or 2.4 for Silent Hill 2, wibo, PS2 binutils v0.10 and objdiff; it uses the mwccgap submodule.
diff.sh compares the rebuilt executable and overlays with SHA-256 entries; outside CI a mismatch does not fail make. CI uses a private container image.
Project code is MIT; the games and assets retain separate rights. Fifteen files carry Sony confidential notices, and the vsm trees contain disassembled VU microcode. The project prohibits LLM contributions from 2026-09-26.

Cite

BibTeX

@misc{silent-hill-3-memory-of-alessa-decomp-case,
  title = {{memory of alessa: an in-progress Silent Hill 3 PS2 matching decompilation}},
  howpublished = {\url{https://github.com/dreamingmoths/memory-of-alessa}},
  url = {https://github.com/dreamingmoths/memory-of-alessa},
  urldate = {2026-10-19},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/silent-hill-3-memory-of-alessa-decomp-case/}}
}

Plain text

memory of alessa: an in-progress Silent Hill 3 PS2 matching decompilation. https://github.com/dreamingmoths/memory-of-alessa (accessed 2026-10-19). Awesome REA entry: https://awesomerea.org/resources/silent-hill-3-memory-of-alessa-decomp-case/

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About this entry

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Primary sources

README.md GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
docs/development.md GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
docs/llm-policy.md GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
Makefile GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
silent-hill-3/Makefile GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
silent-hill-2/Makefile GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
tools/scripts/diff.sh GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
silent-hill-3/config/SLUS_206.22/checksum.sha GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
.github/workflows/build.yaml GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
.gitmodules GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
include/sce GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
vsm GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
LICENSE GitHub · dreamingmoths/memory-of-alessa · Revision 28cb323
https://decomp.dev/dreamingmoths/memory-of-alessa