Despite the silence, work on this has been pretty heavy the entire past month. Anyway, I needed someplace to write about some SoM cut content so putting it here!
The Matango Caves Pit Trap
First off, here are a couple pictures:
The left image is the upper right corner of map 321, the right image is the upper right corner of map 320.
The yellow square (right image) is the destination of unused door 0x16A. Map 321 has door 0x16A as a tile-linked event for tile 0xBF. This tile is never actually used on map 321.
Map 321 is primarily composed of map pieces 321 and 322 (this is a coincidence that its map and piece number are 321: they don't often match up like that). Map piece 326 is the cleared stalagmites (on map 321). The map pieces in between, 323-325, appear to be unfinished variations on that pit in the left image above, possibly representing ground sliding in or out of place.
There don't appear to be any events linked to these and almost certainly it was never totally functional. Actually making it functional would be rather tricky, with probably a minimum of a map piece added to map 321's piece list, changing the tile-linked event from door 0x16A to an event (where the event itself uses door 0x16A), and choosing an event flag to track the state of the trap and to control visibility of the new map piece. Oh, and editing map pieces, which is, um, tough.
(Numbering is by somedit standards to make it easy to look up, so map numbers and map pieces are decimal, door number is hexadecimal, etc.)