When the fourteenth object goes into the cauldron, prepare_final_animation clears away objects 3 to 13 and turns every plain block from object 14 on into one of these. Below height $A4 a spark rises two a frame while moving four a frame round the middle of the room: which quarter of the room it is in picks a direction from dX_dY_tbl, and each direction carries it into the next quarter round. Once it is high enough it flies at Sabreman instead, and when it comes within 6 of him on both X and Y the game ends -- through game_over, which sees the finale flag at $5BC3 and shows the closing message.

Every frame each spark takes a random one of the three frames, and leaves its height at $5BC5 for end_of_frame to turn into a tone.