Samorost - Set aside 30 minutes now...
As she of orange hair, Aleks Krotoski, has said, Samorost is the kind of game Harold Pinter would have made: apparently trivial, hopelessly easy to fall into, enclosed spaces where the crazy dialogue you start coming up with in your mind seems at odds with the simplicity of the plot the game designers have conceived.
Samorost and Samorost2 have just won a Webby in the gaming category. They are free, flash-based and just full of potential for some creative writing - the art in the landscapes is surreal and beautiful, with all kinds of nooks and crannies for our imaginations to rumble in.
The slow and logical way you have to explore the landscapes with your mouse to get anywhere in the game makes you come up with possible plots in your head before you read into what you are actually supposed to do.
If you've not quite got half an hour to spare or, if on a late Monday afternoon you're a bit slow, then the hints might help you out.