Chrono Trigger DS is everything the original Super NES release was, and so much more.
For the most part, Chrono Trigger plays surprisingly well on the DS. You can choose to play the game in DS mode, which allows you to use the stylus to quickly navigate through menus at the utmost convenience, or if you're a purist who prefers the original style of set-up, that option is also available. The DS port even includes all the bells and whistles of the poorly-wrought PlayStation release (under Final Fantasy Chronicles)--including the anime movies, bestiary, and music player. The game script's been given preferential treatment as well--even though there were no real issues with Ted Woolsey's work, the new stuff by Tom Slattery puts a familiar story in an entirely different pespective (Frog no longer speaks in Shakespearean tongue.) At any rate, it's a wonderful effort.
Chrono Trigger DS wouldn't be such without the inclusion of some exclusive new game modes and two new dungeons. One of the more interesting new additions is the Arena mode, where you can raise monsters and pit them in gladiatorial battles against a CPU or another friend via multiplayer. Two new areas of exploration include the foreboding Lost Sanctum and the utterly bizarre Dimensional Vortex. And when your journey reaches its fateful conclusion, it is also possible to experience an additional new, DS-exclusive ending that ties in to Chrono Cross.
If you haven't played the original game on the Super NES and just happen to have a DS lying around, now's your chance to play a truly great game. It pulls off a perfect equilibrium of great storytelling, characters you can care about, enemies you love to hate, and a truly epic adventure that spans across the very fabrics of time itself. For everybody else that has ever loved Chrono Trigger--myself included--there can be going no wrong with playing it all over again on the DS.