Players will take on the role of the Overseer, the leader of the shelter, who is responsible for establishing and managing the shelter. Players can assign residents to different facilities in the shelter based on their "SPECIAL" ability to produce various resources. Each resident's "SPECIAL" ability value affects their ability to produce different resources, but the player can increase their ability value by placing them in special facilities for training. Residents' levels and life values will increase over time, and players can provide weapons, defenses, and medicine to help them complete various tasks. In addition, players can increase the population of the sanctuary by recruiting people from the wasteland to join the sanctuary, or by pairing male residents with female residents in the living quarters to produce babies,

Balancing the resources in the shelter, such as food, water and electricity, is also one of the important tasks of this game. Instead of using money to speed up the production time of resources, players can choose to use the "speed up" command, but using this command may lead to a catastrophic failure of the facility, such as a fire or an invasion of radioactive cockroaches. Players will sometimes receive lunchboxes containing rewards, such as items or resources, and can also purchase lunchboxes for a small fee