An episodic narrative mod for Valve Software's Half-Life 2: Episode 2. Explore the remains of a town destroyed by its own tragedy in a collection of short, interactive vignettes. Solve environmental puzzles and uncover the mystery of how, somewhere along the line, the whole world fell out of existence completely.
I may just be easily impressed, but this mod really catches my attention. I can definitely feel some deep story and tension here, and I really would like to see this continued.