The most addictive phone games come in different form, but have one key point in common: They make you feel equal parts frustration and validation as you play.
You don't want to be so stumped you can't make any progress, but if a puzzle is too easy, you won't feel the thrill that comes with advancing to the next level or beating your top score. After all, playing Sim City as a kid would never been as much fun as it was if you got stuck putting down your first water pipe.
Ahead, we've rounded up eight puzzle and obstacle-packed phone games that will test you, in a good way. They're the perfect companions for a commute or long trip. Delve into one, and you'll find yourself so distracted you almost miss your subway stop.