A game is built around one core concept: The players take on the roles of mice in the Mouse Guard, the military and humanitarian force that patrols the Territories, an animals-only realm with medieval-level technolog, and go on adventures that test their beliefs and ideals. There are no humans anywhere in Mouse Guard; just mice and other animals. Most of those other animals are no more intelligent than their real-world counterparts. Mice, weasels, and weasel allies (ferrets, martens, minks, and sables) are the only exceptions: they all have human-level intelligence, build and wield tools and weapons, and have developed complex societies. In their duties, Mouse Guard characters will face many animal enemies, weather the seasons, rescue other mice, assist mouse towns in surviving.