1707bfbc85
Their rule -- score inside a region excluding free-running elements and measure the residual there -- implemented with the mask derived by measurement: five leaf phases per screen, union of what moves. Free-running area is 3.68% on title, 1.63% extras, 1.32% main_menu, 0.00% on both splashes. The control fails. On extras, a 1% threshold masks 9.3% of the frame and removes only ~16% of the phase term (1.7343 -> 1.4569). The rule is sound but conditional: their free-running element is a localised pulsing plate they can crop out, mine is a wide translucent sweep whose contribution is thin and spread. It cannot be cut out without cutting out the picture. And they were right that my ~1.0 was too small. In verify-capture's own metric the term is 5.56 on title, 3.78 main_menu, 3.73 extras, 0.00 on the splashes. My earlier figure came from a greyscale metric over a narrower phase range -- computed one way, quoted as if it applied another. The consequence sorts my oracle rows: the splashes carry no free-running element, so 2.17 and 3.05 mean what they say; title at 14.16 carries +/-5.56, larger than the spread between any two of my rows. Those rows are usable for regression at a fixed pin and not for absolute comparison. Recorded as a limit, not fixed: no pin removes it, since the term is the game's own animation sampled at one instant by the capture. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N7FiFFFwbvG2uxdcEh8HyF
Sylpheed
A clean-room reverse engineering and port project for Project Sylpheed: Arc of Deception (Xbox 360, 2007).
Three things live here, in one repository so that a change spanning them lands as one commit:
| The decoders | crates/sylpheed-formats — the disc's formats, read and verified disc-wide |
| The port | port/ — a Godot 4 project, plus crates/sylpheed-export which converts a disc into the open asset tree it reads |
| The corpus | docs/re/ — what has been reverse engineered, with its evidence, its retractions and its dead ends |
You need your own copy of the game. No game content is in this repository and none ever will be. The exporter reads the disc you supply.
The oracle is the real game
sylpheed-cliand the Explorer are tools for verifying our decoding. They are hypotheses under test and they have been wrong. When something must be checked against the truth, the truth is the game running in Xenia Canary, captured — not any renderer of ours.
This is stated first because getting it backwards is the most expensive mistake this project has made.
Layout
crates/
sylpheed-formats/ the decoders. Disc-wide verified; the corpus is its spec
sylpheed-cli/ headless tools -- render a screen, dump a table, probe audio
sylpheed-viewer/ the Explorer: a human's window onto the disc. STATIC data only
sylpheed-export/ disc -> the open, moddable asset tree
port/ the Godot 4 project. Reads open formats ONLY
authored/ decisions that are NOT on the disc, each with its reason
data/
base/ generated by the exporter. Gitignored, never hand-edited
mods/ drop-in overrides. Yours
docs/
re/ the corpus: findings, refutations, method traps
game/ how the game is navigated -- menus, modals, flight
port/ the port's mission, its handoff contract, modding rules
agents/ how the agent team works together
tools/ capture harnesses, probes, the share tool
exchange/ transient inter-agent files. NOT in git
docker/ the agent containers
Where to start
docs/re/INDEX.md— what is decodeddocs/re/REFUTED.md— what has been tested and dieddocs/re/METHOD.md— traps this project has already paid fordocs/game/navigation.md— how the game is navigateddocs/port/MODDING.md— why the asset tree looks the way it does
Xenia Canary is a separate repository: it is a fork tracking upstream, and it carries our instrumentation.
Conventions
Confidence is per claim, never per document: ✅ CONFIRMED · 🟡 PROBABLE ·
❔ HYPOTHESIS · ❌ REFUTED. A withdrawn result is kept with its reasoning
rather than deleted — that is why the numbers here can be trusted.