This post is from one of several previous incarnations of this site and probably doesn’t quite fit the current format. In a former life this was a group blog and a tumblelog before it became a static jekyll site. If anything looks broken or is worded oddly that could be why. Pardon the dust.
Noah Falstein and Hal Barwood’s rules of thumb for game design (with contributions from other notable industry veterans). Currently 112 items in the list, it’s an ongoing project.