Puzzles come in a variety of forms, from straightforward "here, solve this" to more convoluted riddles in story-driven games. The puzzles in this week's titles are wrapped in different cloths, but they all provide a great challenge no matter what your preference.

Broken Sword: Director's Cut - A classic adventure makes the leap to iPhone, complete with full touch screen controls that top just about every other adventure game on the App Store. George Stobbart is an American touring Paris in the fall. While sipping coffee at a cafe, a man dressed as a clown sets off an explosion. George heads off to investigate, joined by journalist Nico Collard, and the pair travel the globe uncovering conspiracies, cults, and more. An already excellent game that has made a smooth transition to the iPhone.

Cogs - Like sliding puzzles? If you do, Cogs is practically the best game out there. Featuring a gorgeous steampunk-style presentation, you are tasked with solving puzzles not only on flat spaces but in 3D as well. Slide gears and pipes around the surface of each cube, the goal being to connect certain parts of the machine with other parts. You get more points for using fewer moves and working faster, which seems sort of counter-intuitive with sliding puzzles, but the game is great fun to play, nonetheless.

Train Conductor - Time management games where you direct the flow of traffic are a huge hit on the iTunes App Store. Flight Control and Harbor Master are two great examples of this. Train Conduct moves the action to a new location, tasking you with conducting trains traveling across set pieces of track. It's just as challenging and rewarding as Flight Control, only with a different visual flavor.

Aargon - The familiar laser/mirror puzzle game of reflection with a few interesting new twists. In Aargon, your goal is to shine light onto all of the coins by placing and rotating mirrors. Simply drag and drop pieces onto the grid and tap them to rotate. New items can be used later in the game, and obstacles such as TNT make your day a little more taxing than usual. The free Aargon Lite is also available.

NOTE: Games listed may not be available outside of North America. Prices are subject to change and are therefore unlisted. Please see the individual game pages for purchasing info.