Greed: The Mad Scientist
Though short, this casual point-and-click adventure is quite challenging, especially if played in "detective" mode. Even some of the puzzle mini-games range are quite difficult indeed, though some are very easy. On the other hand, the hidden-object scenes are all very easy, though nice enough.
The story is a bit more detailed and is portrayed better than many games in this genre, but the mediocre character animation and voice acting might dampen your enthusiasm. There's just not enough content in which to immerse oneself.
For what it is, the game is cohesive and satisfying. It would provide a short and somewhat challenging experience for fans of the genre.