I'm currently diving into the world of casual games (creating, not playing). I was curious as to the style most people prefer to play in a casual game when they are just relieving stress. So, I have a question for all of you. If, for example, your boss had just given you a break during work, and you logged onto a website looking to play some games for the 15 or so measly minutes before you go back to work, would you rather log on and play a puzzle, relax-by-challenging-yourself game, or more of an arcade-style, beat-the-high-score-ish game? Any other comments welcome.

GMX,

I think the following post might be of interest for you. It's about the popularity of different genres among casual gamers:

http://forums.indiegamer.com/showthread.php?t=11942