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Power ups also add a layer to the game. Each power up is suitable to a different situation. Some slow down time, some allow you to throw a rapid fire stream of balls, and some make your balls explode on impact. Figuring out when to use each is not difficult, but it is important.
I have become quite enamored with arcade games on mobile. The genre fits well for three reasons: they tend to be easy to learn but difficult to master, they can be played in quick sessions, and comparing high scores with friends is much more reasonable than real-time multiplayer. Smash Hit hits most of those categories on the nose. The only exception would be quick sessions; checkpoints are several minutes apart, meaning that I only start up this game if I know I have some time to spare.
Android or iOS. The premium version is well worth the $2 they ask for.