You may have heard of a mobile game called Ballz. It's a game where you launch tiny spheres at an advancing wall of bricks to knock them out. As the game progresses, the bricks get stronger, and the amount of balls you launch each turn increases proportionally.
Ballz, however, is a pretty direct copy of One More Brick, which came several months earlier. Not only that, but OMB has more features -- like special icons you can hit to make your balls double, bounce, spray in all directions, or damage an entire row or column. The gameplay is simple and addicting, making it a perfect time-waster game.
One particularly fun feature is the ability to make custom balls. For enough stars (the in-game currency), you can make a ball of any size and speed with two special traits of your choice. Careful, though -- the better the ball, the pricier it'll be.