Right now I'm playing [b]999: Nine Hours, Nine Persons, Nine Doors[/b] for the DS. It's basically a cross between [b]Professor Layton[/b] and [b]Saw[/b] -- you're kidnapped and placed onto a ship with eight other people as part a game and must solve puzzles to get off the ship, or else a bomb implanted in you will explode. The puzzles are of fair difficulty; some of them will stump you, and others will click right away, but none that I have done so far have required bizarre logical leaps or anything like that.
There are two gameplay modes: One, of course, is the puzzle mode, where you're in rooms and have to solve puzzles to get out. The other is the story mode, where everything unfolds like a visual novel. The story is told with good detail (especially where the violence is concerned), and occasionally you'll get choices about what to do or where to go that affect how the story develops. This is important because there are six endings to the game, four of which (at least) are bad endings. (I've experienced two of them so far.) After you beat the game, you unlock a sort of New Game+ mode where you go back through the game and can skip dialogue you've read before, and choices you have gone through previously will be grayed out, so you make different choices the next go around.
That's the only way to get the entire story. Going through different paths reveal various parts of the story that make the whole slightly clearer. Once you start, some of the characters are tough to get behind because they aren't fleshed out much (since a lot of the story is focused on getting the hell out of rooms and random tangents), but details mount up on different playthroughs, and my opinion has definitely shifted on a couple of people. (For instance, I disliked Lotus at the start, but now I think she's awesome.)
So, yeah, pretty cool so far. For anyone who has played the game, I got the endings where [spoiler]Clover axes Junpei, and where a mysterious person slaughters the whole group before Junpei can get on a submarine[/spoiler]. Some of the backstory details are becoming clearer, as well ...