From the description in the AppStore, and based on having played the original extensively, it looks like Chapter 1 is the first two chapters of the DS game (there are four in total). I'm hoping this means that Chapter 2 will be parts 3 and 4 of the DS version, and that Chapter 3 might be the expansion which was released on the 360.
Definitely worth the money - though I like Samurai Puzzle Battle, I can't help but feel that it lacks something when compared to Puzzle Quest.
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