Theresia for the Nintendo DS is a horror tinged first person adventure that calls to mind the likes of Myst or D. It contains 2 separate stories, called Dear Emile and Dear Martel. It's one of the few M-rated games on the handheld, but it earns that through dark imagery and themes as opposed to explicit violence or sexual themes.
The first story, Dear Emile, is the story of an amnesiac young girl who wakes up in an asylum/dungeon, and must search out her past and solve puzzles to escape and learn her own true story. The control interface with the touch screen works pretty well in place of a point and click setup, although on a small screen it can be difficult to tell what you can and can't click on. Still, there is a nice atmosphere of dread throughout, and a few of the puzzles are pretty clever.
The second story, Dear Martel, is the story of a doctor who works to discover a cure for a disease ravaging an orphanage, but unlocks some sinister evil in the process. I haven't finished this story yet, but it seems like it may be the longer of the two from the start, though I'm told it's shorter.
I like Theresia as a theowback to PC games I used to read about, but never played. It's atmospheric, offers some good puzzles, and uses the second screen for mapping, which helps keep things moving. Parts of the game drag, adding little to the story and feeling just like puzzle interludes, but not enough to ruin it for me.
Played it? Hate it? Have any memories where it kept you entertained on a trip?