Interesting video about "the joy of discovery" in games from the developer of Braid.

The phrase "the joy of discovery" really struck a cord with me.  I experienced this playing the classic adventure games in my early gaming days, but also while recently playing Limbo.  I think it is a step in the right direction to design games that don't hand you the answers on a plate, and where part of the challenge is simply figuring it out.  It is also quite promising for the revival of the adventure game genre.