Joining the variety of matching-games available, the Happy Planets game created by LetPlayGirls.com stands out from the crowd throughout its futuristic design. rnThe purpose of the game is to pass from one level to another while achieving the necessary scores to do so. How does it work? It is as simple as saying "Pluto"! With horizontal and vertical movements, players have to match at least 3 planets of the same kind to gain points. rnThe longer the line, the higher the score level.