FalloutShelterAppleStoreLogoThe following is based on Fallout Shelter and some details might contradict canon.
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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.


FOS Survival mode
  • Resources drain at a faster rate.
  • Incidents do more damage.
  • Vault dwellers can't be revived, whether in the Vault, in the Wasteland or on quests.
  • Objectives are more demanding, but give better rewards.
  • Quests are more challenging.
  • Deathclaws start appearing at 35+ dwellers instead of 60+.