Two results from the running game, one positive and one a clean negative.
POSITIVE: with word A = 0x0001FFFE (stages 1-16) every entry Stage01..Stage16 is
selectable, where the control run had only Stage01 and the rest greyed. Stage16
reads "Lonely Blue Planet - NO RECORD". So any story stage can be launched from
the menu by poking one word, with no save editing at all -- a simpler lever than
the GHAD stage-field patch used until now.
NEGATIVE: with word B = 0x3F (challenge stages 24-29 marked cleared) the list
still saturates at Stage16 -- the cursor stops there and further presses do
nothing. That matches the disc: the debriefing config declares exactly
px_deb_stage01..16, so the list is capped by data, not by the mask. The
challenge missions are NOT reachable through MISSION SELECT, and word B does not
feed it.
Also mapped, without finding the caller: the GP_DIALOG registry (tables.pak #41)
gives DLG_GO_CHALLENGE_MISSION_MENU = 41 and DLG_CHALLENGE_MISSION_AVAILABLE = 42
(0-based, in config order). No raw immediate 41/39/37 appears anywhere in the
GamePart code region, so dialogs are raised through a computed index and the
entry point to GamePart 26 is still unknown. New probe: examples/screen_configs.rs
dumps any tables.pak screen config by substring.
