The Yam Yam is one of the most exciting creatures. When it explodes
(by dropping a rock on it, for example), it can turn to nine new
elements. Further exploding Yam Yams can turn to other elements, up
to eight different sets of new elements.

Sometimes the last emerald you are looking for to finish the level
is hidden in a Yam Yam!

Yam Yams pause, move in a straight line as far as they can go, then
pause and move again. Yam Yams will eat diamonds in their way.
