Mythras Imperative is a short, yet complete, compilation of the ruleset for Mythras (RuneQuest 6). While I have yet to play a session with it, the PDF appears fairly complete with rules for character creation, character advancement, skill checks/challenges, combat, equipment, and NPC enemies. Obviously a lot is missing, but that's the point of a sample document. It is an ambitious attempt to create a general rule set that can be played across a variety of settings, giving GMs and players the details necessary for fantasy/medieval, modern, and post modern settings. I enjoyed the crunch of the system that also allowed for a great deal of player fiat and flexibility. For example, the "classes" are simply general tropes that players and GMs can call whatever they'd like (i.e. your physician can be a doctor, herbalist, medicine man, etc. depending upon your setting or desired character backgrounds, yet all have the same skills).
The only reason I gave this 4 stars instead of 5 is that there were one or two missing tables that were referenced within the document. For example, the weapons section mentions a Force rating for certain weapons (no, not Star Wars style force), and yet the Force Table that is referenced is no where to be found. Also, while magic is mentioned, there is no specific section outlining some of how magic works. Obviously I'm not looking for an indepth section as this is a teaser document, but simply a few paragraphs giving guidance as to how many magic points certain spells may cost, their damage amounts, etc. Yes, there is the challenge of creating a broad system for GMs to make up any setting they want, but a small amount of guidance could go a long way here.
Over all, great document and good introduction to the Mythras system and d100 roleplaying in general.