int bd_amoeba_2_content_enclosed; // BD amoeba 2 changes to this element if enclosed
int bd_amoeba_2_content_exploding; // BD amoeba 2 changes to this element if exploding
int bd_amoeba_2_content_looks_like; // BD amoeba 2 looks like this other game element
+ int bd_clock_extra_time; // BD engine extra time when collecting clock
boolean em_slippery_gems; // EM style "gems slip from wall" behaviour
boolean em_explodes_by_fire; // EM style chain explosion behaviour
boolean use_spring_bug; // for compatibility with old levels