Power-ups are special bricks in the field with specific functions. You will unlock them by passing levels.But you cannot buy or choose them.

 
Bomb will destroy all the bricks in the field.
 
Laser will damage the entire row or column of bricks, depending on the laser’s direction.
 
Up Arrows will change the path of balls shooting through it.
 
Cannon rotates and re-shoots out balls from its muzzle.