Bonsai Blast (Free)
Bonsai Blast is not a complicated game, but it packs in hours of great fun. Colored marbles travel down a path, and you have to stop them from reaching the end by shooting more marbles at them. Once you've linked three or more marbles of the same color, they disappear and you get points.
Fans of puzzle games will appreciate the 90 Zen-themed maps in Bonsai Blast, as well as the single-tap control method, which saves you the hassle of positioning the cannon before shooting.