-Fireflies always try to follow the left side of a wall or other elements.
-Touching them is deadly.
+Fireflies move through empty space. Touching them is deadly.. Fireflies
+blow up when hit by a falling rock or diamond. Amoeba is also deadly for them.
+They explode into space, producing a 3x3 square of empty space. Fireflies are
+spinning left. They prefer turning left, usually counter-clockwise.
-Fireflies can be smashed by BD style diamonds in addition to rocks.
+There is another variant of the firefly that is spinning right.