We could add Fruit Ninja or Subway Surfers to this list, but everyone has played those games and know all about them. Instead, try something unique and different. Another great game worth trying is Smash Hit.
Smash Hit is more of an arcade game that's also casually addicting. It's also really unique, and unlike anything else on this list. The game is more than a year old, but still something that I install on every mobile device I own.
With Smash hit players will enjoy an increasingly more difficult game with great graphics, a soothing and relaxing soundtrack, yet keep trying over and over again to get further. It's essentially a first-person endless runner. Users will have to throw balls and smash their way through glass walls, obstacles and other things, while also earning power-ups, specials and more along the way. Be careful though, as you can run out of Ammo (balls) and hit a wall, then have to start over. Grrrr.
Your Ammo is also your life, so there's a little bit of skill and strategy on top of everything else, which is another reason this is a great game and fun time-waster you have to try. Play it while waiting for the bus, but don't forget to pause it and save your progress. Another game worth trying is Dune!