Who knew math could be fun? It's not my favorite subject, however, I came across a fun math game while browsing the PlayBook games in App World. It's called Number Mash. The name of the game is to add up balls with numbers to reach sums required by game (for example: 10, 14, 20...). But if you get too far behind, the balls will reach the bottom of the screen and game is over. And best of all, this game is FREE!