Aliens called the Abla come to Earth in the late 20th century, inform humanity of an impending catastrophe, and transport the entire human race to the colony world of Mach.
The box set contains three black-and-white 32-page booklets. Books I and II contain the rules for the game. Book III is an adventure entitled "Frontier Series #1: Guilden's Farm."
Mach uses traditional polyhedral dice, mainly percentile. The group is encouraged to decide what their version of Mach is like, develop the starting region, etc.