Sylpheed/docs/re/menu-navigation-semantics.md

# The title menu — how it moves, and where each button goes

**Status:** ✅ `CONFIRMED` (**measured**, by driving the running game) for the
movement rules and for all **five** main-menu destinations, `NEW GAME`
included (→ `DIFFICULTY` → `SELECT DATA`, not a hang — corrected 2026-09-12,
see the Q4 table). 🟡 the GamePart *id* behind each destination is a **name
match onto the decoded id table**, not a measurement.

Answers [MISSION Q5](../port/MISSION.md) and most of Q4. Nothing here is on the
disc in any form found so far — the port is **authoring** these rules from this
page, not transcribing a field.

## Q5 — movement

Two boots via `tools/re-capture/boot_menu.sh`, cursor read off the focus ring
with [`tools/re-capture/menu_focus.py`](../../tools/re-capture/menu_focus.py).

| | behaviour | evidence |
|---|---|---|
| **initial focus, main menu** | **`TUTORIAL`** — the *middle* item, not the top | 2/2 boots, the first frame after the menu appears |
| **initial focus, `EXTRAS`** | `MISSION SELECT` — the top item | [`extras-wrap.png`](captures/menu-nav/extras-wrap.png) |
| **⬆⬇ — one item per press** | one item per press | ✅ *indirect but sound*: the wrap montage's **4 presses from `EXTRAS` landing on `OPTIONS`** only counts out if each press moves exactly one |
| **⬆⬇ — no auto-repeat** | 🔴 **UNSETTLED, corrected 2026-09-12 — do not read this row as "none."** See [`f1-no-repeat-was-the-harness.md`](f1-no-repeat-was-the-harness.md): the driver this measurement drove input through (`--hid=file`'s `GetKeystroke`) is *deliberately* built to deliver exactly one event per press, by design, for other scripts' benefit — so it could not have shown repeat regardless of what the game does. A held direction moving the cursor exactly once was real and reproducible; what it proves is narrower than "no auto-repeat" and may be nothing at all. Kept below for the record | ~~measured 2026-08-30~~, [`data/nav-autorepeat-and-settled-b.txt`](data/nav-autorepeat-and-settled-b.txt). The counter passed its own control (a single 0.12 s tap gives exactly **1** spike, the hold gives **1**, against a 0.0003–0.0038 noise floor) — the counter was never the problem |
| **wrap at the top** | ⬆ from the first item goes to the **last** | [`wrap-montage.png`](captures/menu-nav/wrap-montage.png), panels 1→2 |
| **wrap at the bottom** | ⬇ from the last item goes to the **first** | same, panels 3→4, and 4 presses from `EXTRAS` landing on `OPTIONS` — i.e. wrapping — is what makes the count come out |
| **left / right** | **nothing**, on the main menu | cursor unmoved across one ⬅ and one ➡ |
| **Ⓑ on a submenu** | returns to the parent **with focus restored to the item you entered from** — `LOAD GAME`→`LOAD GAME`, `TUTORIAL`→`TUTORIAL`, `OPTIONS`→`OPTIONS`, `EXTRAS`→`EXTRAS` | 4/4 |
| **Ⓑ on the main menu** | ✅ goes to the **title** — measured 2026-08-30, delivery-confirmed, **≤ 0.4 s**, and with **no loading screen** in between. ✅ **and the plate IS re-drawn**: Ⓑ on the menu at 351.2 s, plate pulse detected at 358.5 s — ~7 s later (2026-08-30) | **1 run** — [`../re/data/b-on-main-menu.txt`](data/b-on-main-menu.txt) · [mid-build-in](captures/title-builds/live-b-on-menu-title-buildin.png) · [settled](captures/title-builds/live-b-on-menu-title-settled.png). The footer point below still stands |
| **Ⓑ on the title** | ✅ **nothing** — 20 s after a delivery-confirmed Ⓑ the screen is still the title, `PRESS Ⓐ BUTTON` up | measured 2026-08-30, [capture](captures/title-builds/live-b-on-settled-title-no-effect.png) · [series](data/nav-autorepeat-and-settled-b.txt). ✅ **This run waited for the plate pulse — the title's own settled signature — before pressing**, which is what the earlier attempt failed to do; its press landed during the build-in and was confounded. The 4.3 % of pixels that move are the plate's pulse and the sweeps (glyph 730, inside the 714–1520 pulse band) |

Wrap holds on both screens tested — the 5-item main menu and the 3-item `EXTRAS`
submenu — so it is a menu rule, not a per-screen table.

## ✅ 2026-08-31 — SETTLED: a submenu resets to the item it **opens on**, not to its top item

**measured** — [`data/difficulty-resets-to-named-item.txt`](data/difficulty-resets-to-named-item.txt),
[capture](captures/menu-nav/live-difficulty-opens-normal.png).

`DIFFICULTY` is the screen that separates the two readings, because it opens on
**`NORMAL`** — the second of `EASY` / `NORMAL` / `HARD` / `BACK`. Reproduced on a
fresh boot today rather than inherited from the 2026-08-29 capture.

| | |
|---|---|
| opened on | `NORMAL` |
| after 1 delivery-confirmed DOWN | `HARD` |
| after Ⓑ → main menu → Ⓐ → `DIFFICULTY` | **`NORMAL`** — in-cursor **1.0** from opened vs **93.9** from where left |

✅ **So reset goes to the opening item, and the opening item is a per-screen
default that need not be the first.** `DIFFICULTY` returns to `NORMAL`, not `EASY`.

📌 The other four could not settle it because on `EXTRAS`, `TUTORIAL`, `OPTIONS`
and `LOAD GAME` the opening item **is** the first item, so both readings predict
the same observation. Five screens, and only the fifth carries the distinction —
which is why `sylpheed-port` was right to refuse to promote 4/4 to a rule.

⚠️ **Safety, and it is why the run was possible**: `DIFFICULTY`'s *forward* path
crashes the guest (Ⓐ → `SELECT DATA` → `PC 0x82307128`). The probe presses Ⓐ to
enter, one DOWN, then Ⓑ to leave, and **never presses Ⓐ inside a submenu**.

⚠️ Reach: one boot, one round trip. Untested: whether the reset target moves once a
difficulty has actually been **confirmed** — this run never confirms one.

## 🔴 2026-08-31 — a submenu's opening item is NOT always its first: `DIFFICULTY` opens on `NORMAL`

**Already in this file, and I missed it.** `sylpheed-port` has been asking for a
submenu whose opening item is not the first one, because that is what separates
*"resets to the named item"* from *"resets to the top item"*. I told them none of
the screens I measured was one — while **line 248 of this page** records
`DIFFICULTY` as *"`EASY` / `NORMAL` / `HARD` / `BACK` … opening focused on
`NORMAL`"*.

✅ **The provenance is clean and it is genuinely an opening state**: the run drove
`NEW GAME` with **no d-pad**, the screen *"sat unchanged for 90 s"*, and
[`s00a-drive-blocked-by-focus.md`](s00a-drive-blocked-by-focus.md) confirms the
step matched the committed capture at **r = +0.999**.

**So `NORMAL` — the second of four — is a default, not a top item.** That refutes
*"a screen opens on its first item"* as a general description, and it means the
distinction the port is asking about is **real in this game**, not academic: on
`EXTRAS`, `TUTORIAL` and `OPTIONS` the two readings coincide only by accident.

❔ **It does not yet settle their question**, which is about **reset** rather than
opening: to decide it, move the cursor in `DIFFICULTY`, leave, re-enter, and see
whether it returns to `NORMAL` (named) or `EASY` (top). One experiment, and
`DIFFICULTY` is the screen that can carry it. ⚠️ Its exit path crashes the guest
(`SELECT DATA`, `PC 0x82307128`), so the run must go **back** rather than forward.

📌 The failure worth naming is mine: **I searched for a case among the screens I
was measuring, and never grepped the page I was editing.** An answer already in the
corpus is only as good as the reader's ability to connect it — the same amplifier
problem as the stale index row, arriving from the other direction.

## ✅ 2026-08-31 — ALL FOUR measured submenus reset. The main menu is the exception.

**measured** — [`data/submenu-focus-all-reset.txt`](data/submenu-focus-all-reset.txt),
`tools/re-capture/submenu_focus_sweep.py`, one boot, fourth attempt.

| screen | verdict | in-cursor: from opened / from where left |
|---|---|---|
| `LOAD GAME` | **RESETS** | 21.6 / 86.3 |
| `TUTORIAL` | **RESETS** | 2.3 / 113.2 |
| `OPTIONS` | **RESETS** | 1.9 / 102.6 |
| `EXTRAS` (2026-08-30) | **RESETS** | 0.8 / 82.8 |
| **main menu** | **PERSISTS** | — |

✅ **So the rule is simple after all, and it is the opposite of what one screen
suggested**: submenus reset; the **main menu alone** remembers. Four of four.

✅ **Screens confirmed by eye**, because an earlier run was fooled about which
screen it was on: [`TUTORIAL`](captures/menu-nav/live-tutorial-submenu.png) — seven
items under `Level 1`/`Level 2` headers plus `BACK` — and
[`LOAD GAME`](captures/menu-nav/live-load-game-slots.png), a **scrolling** slot list
with the selection held at the vertical centre.

📌 `LOAD GAME`'s 21.6 is the only figure not near zero, and the capture explains it:
that list **scrolls** instead of moving a ring, so re-entry restores a scroll
position rather than a cursor sprite. Same verdict, different mechanism.

❔ **Still not separated: "resets to the named item" vs "resets to the top item".**
`sylpheed-port` asked for a submenu whose opening item is not its first. None of
these is one — `TUTORIAL` opens on `BASIC CONTROLS`, `OPTIONS` on `GAME SETTINGS`,
and `LOAD GAME` on slot **01**, which *looks* non-first only because slots 19 and 20
are drawn above it by a wrapping list around a centred selection.

⚠️ Reach: one boot, one round trip per screen, one direction, one entry each.
❔ `NEW GAME` stays deliberately untested.

## ✅ 2026-08-30 — EXTRAS **resets**; the main menu **persists**. They differ.

**measured** — [`data/extras-focus-resets.txt`](data/extras-focus-resets.txt),
`tools/re-capture/extras_focus_persistence.py`.

| | ring y | item |
|---|---|---|
| EXTRAS opened on | 347.5 | `MISSION SELECT` |
| after 1 delivery-confirmed DOWN | 427.5 (+80.0) | `MOVIE THEATER` |
| after Ⓑ → main menu → Ⓐ → EXTRAS | **347.5** | **`MISSION SELECT`** |

Re-entry is **0.0 %** different from the first entry. So:

* ✅ **EXTRAS resets.** `sylpheed-port` asserted this in their contract-check when
  nothing had measured it, and I flagged the assertion as an absence of evidence
  encoded as a positive claim. **They were right, and it is now measured.**
* ✅ **`MISSION SELECT` is a genuine INITIAL focus**, precisely because this screen
  resets — unlike the main menu, where a reading not taken on a fresh boot's first
  entry measures history.
* 🔴 **The two screens behave differently, so there is no menu-wide rule.** The
  main menu persists; EXTRAS does not. A generalisation in *either* direction
  would be wrong, which is why wrap (measured on two screens) generalises and this
  does not.
* ✅ The screen was confirmed **by eye** — `E1.png` is EXTRAS, MISSION SELECT /
  MOVIE THEATER / BACK — because the previous run was fooled about which screen it
  was on. And the 80.0 px step independently matches the main menu's separately
  calibrated 79.25.

⚠️ Reach: one run, one round trip, one submenu. `OPTIONS`, `LOAD GAME` and
`TUTORIAL` are untested, as is whether the reset is to `MISSION SELECT` or simply
to the top item — those coincide here.

## 🔴 2026-08-30 (later) — the item NAMES below were wrong, and initial focus is NEW GAME

**The reader was broken and my control could not see it.** `menu_focus.py`'s row
centres are **design-space** rows read off `screenshot` output; my probes fed it
whole-display `x11grab` frames, which carry Xenia's title bar and menu bar and
show the game surface scaled by **1.060**. Caught by ground truth, not by a
control: the probe announced *"on EXTRAS"*, pressed Ⓐ, and opened **OPTIONS**.

Ring rows measured directly (`tools/re-capture/ring_row.py`), no assumed geometry:

| frame | ring y | true item |
|---|---|---|
| first menu entry, fresh boot | **225.5** | **`NEW GAME`** |
| after 2 delivery-confirmed DOWNs | 384.0 | `TUTORIAL` |
| after Ⓑ → title → Ⓐ → menu | **385.5** | `TUTORIAL` |

* ✅ **Initial focus on a fresh boot is `NEW GAME`** — 2/2 fresh boots, both the
  *first* menu entry. That agrees with `boot_menu.sh`'s own closing line and with
  [`menu-state-in-memory.md`](menu-state-in-memory.md)'s four-downs-to-`EXTRAS`,
  which only counts from `NEW GAME`. ~~"initial focus, main menu — TUTORIAL"~~ in
  the Q5 table below is **withdrawn**: it is the outlier, and this reading is the
  direct one.
* ✅ **Persistence stands, and is now geometry-free**: 384.0 vs 385.5, 1.5 px
  apart. An equality test is immune to a constant offset, which is why that
  conclusion survived a broken reader when the labels did not.
* 🔴 **The names I published for it were two positions out** — reported
  `TUTORIAL → EXTRAS → EXTRAS`, truth `NEW GAME → TUTORIAL → TUTORIAL`.
* ⚠️ **The control was structurally blind to this.** "Two DOWNs must move the
  cursor exactly two items" tests *relative* motion, and a constant offset
  preserves relative motion exactly. **A control that only checks differences
  cannot see an error in the origin.**

[data](data/menu-focus-reader-offset.txt)

## ✅ 2026-08-30 — the menu REMEMBERS its cursor across menu → title → menu

**measured** — [`data/focus-persists-across-title.txt`](data/focus-persists-across-title.txt),
`tools/re-capture/focus_persistence.py`. One run, control passed:

| step | focus | ring vector |
|---|---|---|
| F1, on the menu | `TUTORIAL` | 130 76 **254** 69 64 |
| F2, after 2× DOWN (**both delivery-confirmed**) | `EXTRAS` | 130 76 66 69 **254** |
| F3, after Ⓑ → title → Ⓐ → menu | **`EXTRAS`** | 130 76 66 69 **254** |

**F3 == F2, so focus persists** — the menu is re-entered on the item you left,
not on a fixed one.

📌 **And this reframes the disagreement below rather than settling it.** If focus
persists, then *any* "initial focus" reading not taken on a fresh boot's **first**
menu entry is measuring history. The records need not disagree about the game at
all — they may differ in what the cursor had already been moved to. **Nothing here
says what the menu opens on**; this run's F1 was itself carried over from a prior
probe's press.

⚠️ Reach: one boot, one round trip, one direction. Persistence across a **reboot**
is untested, and is the reading that would matter for authoring a default.

⚠️ **2026-08-30 — and the sources DISAGREE, which nothing here had noticed.**
`boot_menu.sh`'s own closing line says *"AT MAIN MENU (cursor on NEW GAME)"*, and
[`menu-state-in-memory.md`](menu-state-in-memory.md)'s run reaches `EXTRAS` in
**four** downs, which only counts from `NEW GAME`. Two sources say `NEW GAME`;
this table says `TUTORIAL` 2/2. `skip_intro.sh` presses Ⓐ once and no d-pad, so
the harness is not moving the cursor and that does not explain it.

🔴 **I tried to settle it and could not: the boot never reached the menu**, twice —
the title gate cannot fire on this title
([harness-title-gate-assumes-a-static-title](harness-title-gate-assumes-a-static-title.md)).
So the disagreement stands, and the round trip that would answer the persistence
question — menu → Ⓑ → title → Ⓐ → menu, is focus where you left it or reset? — has
still never been run. `tools/re-capture/focus_persistence.sh` is written and ready
for a harness that can reach the menu.

**🟡 Initial focus is reproducible but not established as invariant.** Both of my
boots opened on `TUTORIAL`, and both used `boot_menu.sh`. The run recorded in
[`menu-state-in-memory.md`](menu-state-in-memory.md) reached `EXTRAS` with *four*
downs from the main menu, which only works from `NEW GAME`. Either the harness
path matters or something persists. **Do not hardcode `TUTORIAL` without
re-testing it**; what is solid is that the menu does *not* open on the top item
in this harness.

## Q4 — where each button goes

Measured by driving: focus the item, press Ⓐ, read the screen's own title.

| button | screen it opens | evidence | GamePart id |
|---|---|---|---|
| `NEW GAME` | 🔴 **stale row, corrected 2026-09-12** — measured 2026-08-28: `DIFFICULTY` (`EASY`/`NORMAL`/`HARD`/`BACK`) → `SELECT DATA` → guest crash (unrelated cache-manager bug, not a menu fault). The "`NEW GAME` — measured" section further down this same page had the answer already and this table was never updated to match it | [captures](captures/newgame-path/) | `DIFFICULTY`: **no id-table name match** — already tried and refuted (`boot-config-and-gamepart-registry.md`: neither `DIFFICULTY` nor `EXTRA_MENU` survive as call-site strings). `SELECT DATA`: 🟡 `2 GP_SELECT_STORAGE`, a fresh name-guess, same low confidence as every other row here |
| `LOAD GAME` | the save-slot list, `LOAD GAME` / `Current Storage` | [`q4-destinations.png`](captures/menu-nav/q4-destinations.png) left | 🟡 `3 GP_LOAD` |
| `TUTORIAL` | the lesson list, `TUTORIAL`, Level 1 / Level 2 | same, middle | 🟡 `25 GP_TUTORIAL` |
| `OPTIONS` | `OPTIONS` — GAME / CONTROL / SOUND / SCREEN SETTINGS / BACK | same, right | 🟡 `8 GP_OPTIONS` |
| `EXTRAS` | **`GP_TITLE.pak` build 6** — MISSION SELECT / MOVIE THEATER / BACK | [`ui-title-build-map.md`](ui-title-build-map.md) | 🟡 `5 GP_EXTRAS` |
| `EXTRAS ▸ MISSION SELECT` | the stage list + Wide Area Space Map — **8 rows visible of 16**, and rows below the first are **locked** on a fresh save ([below](#-mission-select-the-cursor-was-stuck-because-the-stages-were-locked)) | [`mission-select-stage01-only.png`](captures/mission-select-stage01-only.png) | 🟡 `7 GP_MISSION_SELECT` |
| `EXTRAS ▸ MOVIE THEATER` | ❔ not tested | | 🟡 `6 GP_MOVIE_THEATER` |

**Say which, as the gate asks.** The *screen* each button opens is **measured** —
I pressed the button and read the title off the framebuffer. The **GamePart id is
not measured**: it is the entry of the decoded 29-id table at `.rdata 0x820A1630`
([`challenge-mission-gate.md`](challenge-mission-gate.md) §3) whose *name* matches
the screen I saw. The table is decoded; the *binding* of a button to an entry in
it is a name match I made by eye. The port should treat these ids as authored.

Worth noting that the ids and the paks are not one-to-one: `GP_EXTRAS` is id 5
with **no pak of its own** — its artwork is a build inside `GP_TITLE.pak`.

~~**❔ `NEW GAME` was deliberately not pressed.**~~ **Withdrawn — stale, fixed
2026-09-12.** This line said Ⓐ on it hangs the emulator
([`ui-paint-order-third-permutation.md`](ui-paint-order-third-permutation.md)),
which the very next section of this same page already refuted on
2026-08-28: it does not hang, it opens `DIFFICULTY` then `SELECT DATA` before
an unrelated crash. Kept struck rather than deleted — this is the exact
failure this corpus keeps naming, a correction that landed lower in the
same document than the claim it corrected and never caught up to the table
above.

### 🔴 The "cheap way to finish this" was a dead route — WITHDRAWN 2026-08-29

This section used to say: *`0x828A690C` holds a live screen id (1 title, 3 main
menu, 4 extras) and `0x828F38AC` the cursor; read them while pressing Ⓐ and the
transition becomes a measurement, under `--gpu=null` with no screenshots.*

**Do not do that. Those words are monotonic counters, not state.**
[`menu-state-in-memory.md`](menu-state-in-memory.md) withdrew that identity **on
the same day it was published** — driving deep and then pressing Ⓑ three times
sends the "cursor" `36 → 38 → 40 → 41`, and a cursor returns when you go back.
The values match across runs because the same key sequence produces the same
count, not because `3` *means* main menu. With the sign-in fix the sequence runs
`3 → 5`, skipping `4` entirely, so "4 = extras" was never a screen at all.

This page kept recommending the route for three days after the page it cited had
killed it. ⚠️ **A cross-reference is not a citation unless you re-read the target**
— the two documents disagreed in the corpus and either would have been believed
on its own.

✅ **What those words are still good for**: all three advance if and only if the
game responds to input, and are stable when it does not. Read them as *"did the
game react?"*, never as *"which screen is this?"*. Screen identity still has to
come off the framebuffer.

❔ **So a measured button→GamePart-id binding remains unfinished**, and for the
reason it always was: no screen/state enum has been located in guest memory. The
ids in the table below stay a name match.

## ✅ `NEW GAME` — measured 2026-08-28, and it is not a hang

The one destination this page could not test has been driven. **Ⓐ on `NEW GAME`
does not hang.** It opens two more menus first:

```
NEW GAME  ->  DIFFICULTY  ->  SELECT DATA  ->  guest crash
```

* **`DIFFICULTY`** — `EASY` / `NORMAL` / `HARD` / `BACK`, footer
  `Ⓐ : OK  Ⓑ : Back`, opening focused on **`NORMAL`**
  ([capture](captures/newgame-path/newgame-difficulty.png)). It sat unchanged for
  90 s with the emulator healthy — a menu waiting for input, which is exactly
  what "a standing hang" looks like to a screenshot loop that never presses
  anything.
* Ⓐ on `NORMAL` → **`SELECT DATA`**, a save-slot picker headed
  `Current Storage: Dummy HDD`, prompting to pick a file for the auto-save.
* Then the guest throws, and Xenia pauses with `PC: 0x82307128`
  ([capture](captures/newgame-path/newgame-selectdata-crash.png)).

**That crash is already in the corpus and is not new**: `0x82307128` is inside
`sub_823070B0`, the cache-manager STL erase documented in
[`title-crash-stl-tree.md`](title-crash-stl-tree.md), whose trigger is an
incomplete on-disc shader/code cache — not the menu path. The corpus also already
holds `captures/select-data-crash.png`.

So Q4's last row closes as **measured**:

| button | screen it opens |
|---|---|
| `NEW GAME` | **`DIFFICULTY`** (then `SELECT DATA`) |

🟡 The GamePart ids for these two are unmeasured, like the rest — `24 GP_DIALOG`
and `3 GP_LOAD` / `2 GP_SELECT_STORAGE` are name-match candidates and nothing
more.

### Initial focus — six data points now, and it still varies

This boot opened the main menu on **`NEW GAME`**. Running tally across four
boots of the same harness: `TUTORIAL`, `TUTORIAL`, `NEW GAME`, `NEW GAME`.
Unchanged conclusion: **do not hardcode it.**

✅ **Two more, 2026-08-29, and the split is now even.** A drive that pressed Ⓐ
with no d-pad movement ended in a **tutorial mission** (+0.960 against
`tutorial-mission-reached-then-crash.png`), so that boot opened on `TUTORIAL`. A
later boot read **`NEW GAME`** from a focus detector on the first menu frame.

**Tally: `TUTORIAL` ×3, `NEW GAME` ×3.** Six boots, same harness, no other item
ever seen. ⚠️ It is *not* uniform across the five buttons — only these two occur —
which is a constraint on whatever selects it, and something a future explanation
has to account for. Still **do not hardcode it**, and note that
`newgame_path.sh`'s "NEW GAME is the first item so no d-pad is needed" is wrong
half the time — see [`s00a-drive-blocked-by-focus.md`](s00a-drive-blocked-by-focus.md).

### The `NEW GAME` path completes — the `SELECT DATA` crash is state, not path

A second run of the same path, 2026-08-28, **did not crash**:

```
NEW GAME → DIFFICULTY → (Ⓐ on NORMAL) → SELECT DATA → (Ⓐ on a slot) → a movie plays
```

The previous run's throw at `PC 0x82307128` is therefore **not inherent to this
menu path** — the same six presses got through it. That is consistent with the
trigger `title-crash-stl-tree.md` already names (an incomplete on-disc cache) and
with nothing about `NEW GAME`. 🟡 n = 1 either way; do not read it as "fixed".

Worth recording because the first observation could easily have hardened into
"the new-game path crashes", which is what "A on NEW GAME hangs" had already
become once.

---

## 🟡 Refutation attempt 2026-08-29 — the main menu's own footer does **not** advertise Ⓑ

**Attempted claim:** this page's row *"Ⓑ on the main menu goes to the title,
which re-draws `PRESS Ⓐ BUTTON` after a beat"*.

**Why this row and not another.** It is one of only **two** rows in the Q5 table
with an **empty evidence cell** (the other is "Ⓑ on the title → nothing"); every
row that cites a capture cites one. And it is a rule the port will build on
directly — it is the only way out of the main menu.

**The measurement** — whole-frame colour test for the pad-glyph discs, run by
[`tools/re-capture/footer_and_locked_rows.py`](../../tools/re-capture/footer_and_locked_rows.py)
against the committed captures:

| capture | Ⓐ glyph px | Ⓑ glyph px |
|---|---|---|
| `live-main-menu.png` | 438 | **0** |
| `live-main-menu-options-focused.png` | 438 | **0** |
| `live-extras.png` | 440 | 514 |
| `difficulty-screen.png` | 438 | 518 |

**The control passes twice over.** The same detector, unchanged, finds the red Ⓑ
on the two screens that visibly have one; and the **Ⓐ** count is 438/438/440/438
across all four, i.e. the same glyph asset at the same size on every screen — so
a Ⓑ of that family would have been ~450–520 px and cannot have fallen under a
threshold. The negative is over the **whole frame**, not a guessed footer band:
`live-main-menu.png` contains **zero** red-glyph pixels anywhere.

So the main menu's legend reads `⊙ : Select   Ⓐ : OK` where every submenu reads
`⊙ : Select   Ⓐ : OK   Ⓑ : Back`.

**Verdict: the claim SURVIVES, at reduced confidence, and the row is downgraded
to 🟡.** A legend is not behaviour — a game may accept an unadvertised Ⓑ — so an
absent glyph cannot refute a press that was actually observed. But:

* the observation has **no capture behind it**, and it is now the only Q5 row
  contradicted by the game's own on-screen text;
* there is a **named confound**: the title-side screens auto-return on idle, and
  "I pressed Ⓑ and ended up at the title, which drew `PRESS Ⓐ BUTTON` after a
  beat" is also exactly what an idle timeout looks like to an observer who does
  not hold the two apart. The corpus documents that timeout at ~8–10 s
  ([`boot-config-and-gamepart-registry.md`](boot-config-and-gamepart-registry.md)).

**What would settle it:** press Ⓑ on the main menu and read `0x828A690C`, the
live screen id (`1` title, `3` main menu, `4` extras) — a transition inside a
second is a Ⓑ, one at ~8–10 s regardless of the press is the timeout. Cheap, and
it needs no screenshots.

🔴 **Not runnable here.** This container has no disc and no ISO, so there is no
oracle at all — see
[`capture-harness-status.md`](capture-harness-status.md#-2026-08-29--the-disc-is-not-in-the-decoder-container-at-all).

**For the port:** Ⓑ from the main menu to the title is **measured, single
observation, uncited, and unadvertised by the game**. Implement it — it is the
only exit — but treat it as authored rather than transcribed, and do not also
build the idle-return on the assumption that the two are distinct until someone
has separated them.

---

## ✅ MISSION SELECT: the cursor was stuck because the stages were **locked**

**Measured 2026-08-29 from committed captures**, no disc needed. Settles the
⚠️ open in [`../game/navigation.md`](../game/navigation.md): *"sixteen d-pad
presses never left Stage 01 — whether that is because only one stage was
unlocked, or because the list is driven some other way, is unknown"*.

The stage list has **three** label brightnesses, not two, and that is what
discriminates. Sampling the label strip (x 190…320) of each of the 8 visible
rows, 95th percentile of luminance:

| capture | row 1 | rows 2–8 |
|---|---|---|
| `mission-select-stage01-only.png` | **254** | **104** |
| `mission-select-all-story-unlocked.png` | **254** | **183** |
| `mission-select-ends-at-stage16.png` | 183 | 183 ×6, then **254** on row 8 |

* **254** = focused (the row carrying the spinning focus ring)
* **183** = unlocked, not focused
* **104** = **locked**

The all-unlocked capture is the control: it holds row 1 focused at the identical
254 while rows 2–8 move 104 → 183 as one uniform step. So the dim rows in the
Stage01-only capture are **not** "unfocused"; unfocused is 183, and they are
79 levels below it.

**And the cursor does move when they are unlocked.** In
`mission-select-ends-at-stage16.png` the list has scrolled to show Stage09…16,
the scrollbar thumb is at the bottom, and the focus ring is on **Stage16** — the
last row. Locked list: 16 presses, no movement. Unlocked list: the cursor reaches
the end.

| | |
|---|---|
| **rows visible at once** | **8** |
| **list length** | **16** (`Stage01`…`Stage16`; the scrollbar bottoms out at 16) |
| **why 16 presses did nothing** | every row below the first was locked |

⚠️ **Reach.** This is a still image, so it says the cursor *reached* Stage16, not
how it got there and not whether the list wraps — the scroll thumb bottoming out
at row 16 is consistent with either. Whether a *locked* row is skipped or simply
unreachable is likewise not separated: with only row 1 unlocked the two are the
same observation.