This game is based on an ancient game of "locusts" The idea is to exchange the places
of the dragons by either moving them into the empty space or jumping over one dragon
into the empty space. Green dragons only move left, red dragons only move to the
right. When you can't move any more, click the mouse near the restart box. Did you
get all four green dragons at the left most spaces and the red ones to the right?
CONGRATULATIONS! ( it took me FOREVER to figure it out ) The Y~innons like this puzzle
so much, some of their control codes are based on it!