My Appendix N
The original AD&D Dungeon Master’s Guide is often considered one of the best role playing game books ever published. It isn’t that the rules presented are perfect, but that Gary Gygax presents his reasoning and ideas, and he encourages the reader to build his own world and rules the same way. It’s a good book, and I was very happy to be reminded of this about a year ago when I got a new copy of it and started to flip through it again.