Blosics 2 Level Pack is an awesome user-generated Time Waster
When Lee reviewed the original Blosics time-waster back in 2009, he concluded the review with the words "I just wish there were more levels, but I'll be heading back for another round."
Well, it seems like Lee's wish has been granted, with the Blosics 2 Level Pack. Gameplay is exactly like the original: You shoot cannon balls out of a certain area of the screen, trying to make a tower of bricks topple. When the bricks fall into the abyss you gain points, but every ball you shoot also costs you points. You also have four different balls sizes – the larger the ball, the more expensive (and powerful) it is. It comes down to figuring the most effective trajectory and tactic for toppling the tower.
The are 30 user-generated levels, and it's very addictive. I made it all the way to level 15 before the need to perform some actual work caught up with me. Very engaging.