Mnemonic Referee's Guide

From the introduction:

This booklet contains the information you’ll need to run a Mnemonic game. While most of what you need to know is in the Player’s Guide, the Referee’s Guide has detailed instructions on how to resolve action attempts and determine a wounded character’s Status. It also includes a number of optional rules and techniques for playing the game. Since the information here expands on topics covered in the Player’s Guide you should already have read that booklet.