-The BD style amoeba has some special properties: When it is completely
-surrounded, it instantly turns into the specified content. But if this
-cannot be achieved in a certain amount of time, this amoeba instantly
-turns to BD boulders instead. BD amoeba is the only amoeba that can be
-smothered by the player.
+The BD style Amoeba grows randomly through empty space and sand.
+When it is enclosed, it stops growing and transforms into diamonds (or
+some other, configurable game element).