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B6A2: Collapsing block (type 143)
The collapsing_block (collapsing_block). It sits still until something lands on it, then crumbles: it becomes type 184, which upd_112_to_118_184 steps on to 185 with a sound, and type 185's handler (upd_185_187) makes it vanish the frame after. Rebuilding the room brings it back.
upd_143 B6A2 CALL upd_6_7 pixel offsets
B6A5 BIT 3,(IX+$0D) wait for something to stand on it
B6A9 RET Z
B6AA LD (IX+$00),$B8 crumble
B6AE JP upd_112_to_118_184
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