Skill mastery in games

Stumbled on this interesting article from Gamasutra on the chemistry of games. Apart from presenting ideas it also tries to give a quick set of tools for evaluating your gameplay too see if it is fun, and maybe find out what is wrong with it. Worth a read, and maybe I should try it out on my Warlocks game - that BTW is getting closer to a playable state, so keep your eyes and ears open for a beta-invite. ;-) As a special treat for those who read my blog, here is the first public screenshot of the game in action. You can't wait now can you?!!! It is made with XNA using stock graphics and free sound effects. It is running on both Windows and the 360.