Right now I'm playing Santa Post, it's really engaging and good looking. Also I'm playing Candy Crush and just can't stop for 2 years, they made too many levels.
I really like Rocket Mine, although the v.2 it's not for my taste. Everything got weird in the new version, the movements, explosions, sounds... I'll stick with the original.
I'm currently playing REBUS - Absurd Logic Game. I made all my friends and family play, and they were hooked as well. Some rebuses were pretty simple while others made me frustrated. But you feel proud of yourself once you guess the answer It's worth the time, and it's free.