Balls of annihilations

"Balls of annihilation" - original and exciting game, dedicated to the destruction of the balls!
  The rules are simple: you have to clear the field, colliding with each other balls. On each seventh step on the field appear an additional ball.

How to play:
  To earn points, you must destroy the balls of different colors. Each ball has its own mass. You can select one ball, and then select any other and get points equal to the difference between the masses of the balls. Or you can choose a ball and hold your finger to select any ball on the horizontal / vertical and annihilate an entire row (of course if mass of the selected ball is big enough).
  In the collision of balls of the same color, they are glued to one with greater mass!