This was a nice article that explains how some of the games I played as a youth were NP-hard. I suppose that makes me feel better that I was such a great player. I’ve read part of this and will read it completely after my finals.
EDIT (July 2013): So it took a little longer than I thought for me to finish reading. I was fairly impressed with these results, though I can understand if some “serious” scientists might not think highly of these. Professor Erik Demaine lists this article as a manuscript**, so it looks like it hasn’t been accepted into a prestigious conference.
The paper itself is easy reading, and you don’t have to be an expert in theory to understand the big idea. The techniques mostly rely on reducing the game to a set of really simple rules.