It is a simple brick like projectile.
It always flys in the same Angle, only variation is up and down.
When it hits the highlighted brick it collides.
Every other brick on the left or right side make it disappear and higher the score of the other person in the same time.
It may be possible that the brick also disappears when the highlighted brick gets hit, and shooting another projectile taking into account if a upper or lower brick was hit last to define the if it should have a angle down or up.
Well, there are different possibilitys to create this, it all depends on the possibilitys :)
