From the introduction: For use with Mission to Mercury Playset, appearing in The Fiasco Companion. ... Use this document as a touchstone for play — it lays out, in the very broadest terms, who is going to be on Mercury, what equipment is around, what the habitat is like, and what the various missions are. All of this is intended to provide a gritty, highly constrained backdrop for your session. None of it is intended to get in the way of the action.