Bubble Blitz (2013)

For the most part it's very much a game you've played before, but it's also one of the most polished versions you can grab from the App Store. There are some neat upgrades to unlock and keep you plowing through the levels too, along with a neat destructive lightning power if you can keep chains of clusters dropping. In other words, it's a little bit moreish, it's very polished, and it will kill more hours than you think you have left to give to this particular type of game.