Final Fantasy 4 DS

The DS remake of the classic 1991 RPG Final Fantasy IV was first announced in May 2007.IGN: Final Fantasy IV DS (May 9, 2007) The remake was developed by Matrix Software, published by Square Enix and released in the U.S. on July 22, 2008.IGN: Final Fantasy IV DS Main PageGameSpot: Final Fantasy IV DS Game Details Page

• Final Fantasy IV DS Walkthrough (now complete)

Final Fantasy IV was originally released in the U.S. as Final Fantasy II (1991) for the Super Nintendo console. In the U.S., this game was the first sequel to the 1987 original game Final Fantasy for the NES.MobyGames: Final Fantasy
However, the "true" sequels to the original game—Final Fantasy II [1988) and Final Fantasy III (1990)—were only released in Japan originally.MobyGames: The World of Final Fantasy - Final Fantasy IV This technically incorrect titling system was used in order to maintain numerical consistency for the North American audience.
Additionally, there were several edits to the game's content, such as the removal of any references to religion or death, and several characters had abilities removed. All the abilities, and a more faithful translation, were restored for the DS remake.Wikipedia: [1]

In Final Fantasy IV, you play as a Dark Knight named Cecil, who lives in the kingdom of Baron under the rule of the evil lord Golbez. At first, Cecil operates as the evil lord's pawn. Cecil eventually turns against Golbez, and sets out to stop him from gathering four powerful crystals from around the world. Together with his Dragoon friend Kain and girlfriend Rosa, Cecil must travel to three different realms in his quest to regain the four crystals from Golbez and restore peace to the world.MobyGames: The World of Final Fantasy - Final Fantasy IV

There are two main gameplay additions to the DS version of Final Fantasy IV: the new "augment" system, and a higher level of difficulty. With the new augment system, the player can find "augments" hidden throughout the game. Augments add new powers and abilities, and can have significant strategic advantages. Additionally, the DS version of the game has a series of mini-games that utilize the DS touch-screen to build up new summon monster Whit.GameSpot: Final Fantasy IV DS Review (July 11, 2008)

• 1up.com: A Day in the Life of Final Fantasy's Nobuo Uematsu (February 15, 2008)