# E037: ordinary puzzle merge and Undo

Two native32x16 fragments have zero overlap. Ordinary controls select and
deposit the first fragment, change its color to match the second, align a
copy of the second, then merge. The displayed result is the exact276-pixel
union of the original masks, hash15de6e0a8052cc0eed4b2e28189f43653611b29af4b4aaed327d5677e05e818f. Ordinary
Undo restores the first selected shape. A full inventory scan independently
matches all13 original shapes AND native RGB palettes. SNO0/LIFT6, empty
password field. Pocket OFF physically returns to the corridor.

The controller follows all original opaque pixels in the observed palette;
transparent pixels reveal the actual background. No original mask is cropped,
erased or edited. The aligned drop target and resulting selected position are
observed from pixels. Native color key296/182 produces aqua;272/182 produces
yellow. Collected order does not establish adjacency in the memory window.

One complete initial laboratory episode, one private snapshot and zero
intermediate restores. Fourteen other whole UI calibration episodes are
excluded from the replay. Final trial HUD1:14:34. The canonical E036 checkpoint
remains unchanged at HUD1:13:30 with13 fragments,0 letters and3 prior ordinary
deaths. No new fragment, code, letter or death. Game incomplete; no final screen
or uninterrupted normal-boot completion proof.

An accepted two-piece union is not a solved four-piece puzzle. Membership in
a final puzzle is unknown. Stored inventory during the merge was not scanned;
exact originals after Undo are verified. Further searches and puzzle assembly
remain outstanding. The earlier thirteen-mask analysis is unchanged.

Replay69.92s,25fps,960x800, silent;789 actual RGB
observations,59.845739 measured PAL seconds.1x
zero-order hold, no interpolation; decision pauses omitted. Explicit2s initial
hold and4s pair-union/inventory holds. Full decode and7 actual-MP4 visual checks
pass.24 unique frozen source archive entries. Successful full trial charges
95.013323s; all15 full UI trials
charge442.826372s, including excluded calibrations.
Execution accounting and replay duration are distinct.

Policy: rendered RGB, ordinary joystick actions and observed memory only.
No game RAM coordinates, hidden contents, pitch/audio, trainer or memory writes.
LIN/CYC is separate declared timing/accounting only. Watchdog, limited inputs
and neutral cleanup remain. No ROM, private save-state, raw RAM dump or executable
is distributed. Public sources contain native PNG observations and controller code.

Primary manual: https://c64online.com/wp-content/uploads/2021/03/Impossible-Mission.pdf
Video SHA256:eb1846b82a738a2dabb7add09f46764c8142e5ae09ead5937486b359c14bb926
YouTube:https://www.youtube.com/watch?v=HkAibixa3BE