For those interested in intriguing puzzles, check out 'Eric Haas Was Right' on LazyLaces site: http://www.lazylaces.com/
LazyLaces is devoted to interesting games. Some are the 'poke around and find clues' variety, others are likeable little quest-type adventures or logic games.
Several have exceptionally high quality in design and graphics, not the sort one would expect on a free games site. There are, of course, the retro-style games such as 'Phantasy Quest' and 'Bloons.'
Be sure to check out some of the links! I found LazyLaces via Spluch - http://spluch.blogspot.com/ - (another great site).