|The following is based on Fallout Shelter and some details might contradict canon.|
| || For the hardest difficulty mode in Fallout: New Vegas or the achievement/trophy, see Hardcore mode.|
For the difficulty mode of the same name in Fallout 4, see Survival mode.
Survival mode is an optional difficulty setting in Fallout Shelter that presents a higher level of challenge to experienced overseers.
Survival mode is enabled by checking the corresponding box above the vault number selection when creating a new vault. It cannot be enabled or disabled from an existing vault.
When selecting the Survival mode button while creating a vault, the game will display a message advising the player not to choose this difficulty unless they are experienced.