9 | Flight Control
Flight Control was directly responsible for the creation of an entire genre of "line-drawing games" on the App Store, but it remains the best of its kind. Directing planes and helicopters to their landing is a great use of the touch screen, and the game gets incredibly frantic if you can make it far enough. It's easy to learn, but hard to master, as a constantly increasing number of incoming flights will have you juggling more than you might be able to handle.
Flight Controls has received continual support from developers Firemint post-launch -- a recent update has even added online multiplayer support and an online voice chat feature, making a somewhat older game new again for the millions who have purchased it.
8 | Doodle Jump
Doodle Jump was the #1 best-selling iPhone game for the majority of 2009, and for good reason. It features a simple premise: keep hopping upwards to improve your score. The game's simple "keep on climbing" platforming gimmick and tight controls made it a huge hit, and spawned countless knockoff titles that developers spammed the App Store with. But what makes Doodle Jump unique is its distinguishable art style, various types of jumping boosts (springs, rockets, and more), plus a variety of different obstacles to dodge and navigate around. It's a mix that just works well, and developer Lima Sky just hit the right formula at the right time.
7 | Cut The Rope
Cut the Rope has become just as much of a "Top 10" sales chart mainstay as Angry Birds, and it's no doubt due in part to its crisp, colorful graphics and charming lead character. In each level, you must figure out how to get a piece of candy from one side of the screen into the mouth of an adorable green critter named "Om Nom." Early in the game, you'll accomplish this by cutting ropes attached to the candy with a swipe of a finger, initiating a physics-powered puzzle that you'll have to use both planning and speed to solve.
Although it sounds simple enough, other elements like a gravity changer and collectible stars manage to keep things fresh, and add variety to an already fantastic puzzler.