Facility 47
This is a fairly short casual point-and-click adventure with great atmosphere and an actual story, told subtly through found documents. There is no handholding, though the hint system works well and can even let you skip puzzles if you've really lost patience.
It's also not the friendliest. You may find yourself trying to click on every pixel on the screen trying to find interactive items, because there are no indications.
And yet I found myself drawn into the beautiful drawings, dark mystery, and the puzzles, some of which gave me a nice casual little challenge. Recommended for fans of the casual point-and-click genre.