The Triassic is the first of the three periods of the earth's Mesozoic Era. Beginning about 250 million years ago after external influences destroyed 95% of all living creatures, it lasted about 45 million years.

It was during this period that the ruling reptiles and dinosaurs made their first appearance on land. It closed with the Jurassic, the heyday of the great dinosaurs, and the Cretaceous. During the Mesozoic the super-continent Pangaea broke up into several individual continents.

The super-continent Pangaea threatens to split into various parts. The players represent herds of living creatures which can move and reproduce. With skillful tactics each player tries to keep his creatures safe on the new land masses (i.e. connected land areas) and gain majorities there.