A while back I posted about Understanding Games, a small series of games that teaches simple aspects of game design.
Episodes 3 and 4 have now been posted:
My comments about episodes 1 and 2 apply to these as well, with the added caveat that I don’t think episode 4 really works. It has significant problems that weaken the points it’s trying to make, that some more tuning in the interactive portions could have fixed. But it’s still a worthwhile effort and I would like to see more things like this.