If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
This is another game where you need to line up 3 ore more balls of the same color. As well as in other games of this kind you can switch positions of adjacent balls. However, in Bola balls do not form horizontal and vertical rows. The only possible straight lines are diagonals. Besides, the way the balls fall after you eliminate a line is quite original.