Gameloft has announced the release of six iPhone and iPod touch titles, available through the App Store today. You might be familiar with most of them, since each has already been published on the Classic iPod, to web browsers, on general mobile phones, and possibly even advanced refrigerators. (Oh, we kid. Those fridges aren't out yet.) We initially had low expectations for these conversions, but after hearing more, we're excited about some of the iPhone-only tweaks to these titles.

Diamond Twister is a tile-matching game, where you swap two adjacent tiles with a swipe of your finger; match three or more, and the like-tiles disappear. While the game mechanic isn't original--Bejeweled and others use the same scheme--Diamond Twister reads the iPhone's orientation to change the game's direction of gravity. This addition lets you chip away at hard-to-reach bottom tiles with just a twist of the phone. Diamond Twister costs $7.99.

Chess & Backgammon Classics returns from its iPod iteration, adding a touch-sensitive interface on the iPhone. In these two games, you can adjust between a portrait and landscape orientation by how you hold the phone. And in Backgammon, you shake the dice by shaking the phone. Just hold on tight. Chess & Backgammon Classics costs $9.99

Brain Challenge runs you through a battery of mental tests and activities, scoring--and potentially improving--memory, reflexes, and more. We're looking forward to the touch interface, since our main gripe with the iPod version was its difficult controls. Sure, it's a knock-off of the Brain Training craze, but one new mini-game responds to the way you twist the screen. Brain Challenge costs $9.99.

Bubble Bash taps a familiar game type Mac players might recognize from Snood. Like the iPod version, you launch colored bubbles up at a grid, popping matches of three-or-more. Finger taps aim and fire the projectiles, while iPhone tilts adjust the position of the bubble canon. Bubble Bash costs $7.99.

Platinum Solitaire mixes single-player card games--including Yukon, FreeCell, Golf, Pyramid, and more--with casino glam. You'll spend real time earning virtual payouts for completing the card challenges. It uses fingertip controls as expected, plus you can shuffle the cards by shaking the phone. Platinum Solitaire costs $7.99.

Platinum Sudoku packs 20,000,000 number puzzles into an iPhone, including a mixture of Kakuro boards. Tutorials train you in the basics of both game times, while you can write answers on the board with your finger. Additionally, you can use the built-in solver to cheat at newspaper puzzles, should your friends be easily impressed with your (supposed) Sudoku skills. Platinum Sudoku costs $7.99.

We're churning away, testing and evaluating new App Store releases. Come back soon for reviews of these and other App Store games.