Second Earth Provides users with the opportunity to visit other unknown planets. The game is made in the genre of Tower Defense and in the style of the science fiction future. According to the plot of the narrative, human civilization has reached such heights in its development that it has now been able to travel to the distant lands of the Galaxy known to them. Humanity began to use this, sending research crews in order to study the surface of other planets.

During exciting scientific expeditions, people try to find a new place for colonization, then to build housing there. From the player in Second Earth, it is necessary to build a base that is designed to become a stronghold on the way to the development of a new land. To ensure the life of their wards and the development of the colony, it is necessary to send reconnaissance detachments. They are designed to find sources of local resources. They can be spent on the construction, implementation of the achievements of progress, the satisfaction of the needs of the colonists and much more.

The settlement needs to be periodically strengthened. This is due to the fact that the indigenous inhabitants of the planet can attack him. Predatory representatives of the local fauna can also make attacks. They do not mind enjoying something new, such as human.