[MIB4223]

I agree with William. I like the GMG a lot. It's one of he few books for GMs that assume that you already know how to run a game and give a more theoretical approach. This is complimented by things that a GM might lack from the core rules, such as a coherent timeline and rules for Word-bound.

I don't recommend IN to new GMs in any case, so those who do run it will want some info on hw to run this specific game, not how to game master in general.