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Throughout Fallout Shelter the player adds rooms to their Vault. There are several types of rooms, each with their own unique purpose.
Access Rooms
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Resource Production & Storage Rooms
SPECIAL Stat Training Rooms
Merging Rooms
Building two or three of the same type of room next to each other will merge them into a bigger version of the room. Rooms must be the same level in order to be merged together. Merged rooms can hold more Dwellerswithin themso they can produce more resources for your Vault.
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Upgrading Rooms
Rooms can be upgrade twice for an additional cost. The higher tier versions of Rooms are more efficient for your Vault, often increasing the production of resources and storage space. It is smart to increase the level of your rooms that produce your most important resources to keep your Vault thriving.