int bd_acid_turns_to_element; // BD acid target element after spreading
int bd_biter_move_delay; // BD biter delay between movements (in BD frames)
int bd_biter_eats_element; // BD biter eats this game element when moving
+ int bd_bladder_converts_by_element; // BD bladder converts to clock by touching this element
boolean em_slippery_gems; // EM style "gems slip from wall" behaviour
boolean em_explodes_by_fire; // EM style chain explosion behaviour