What rooms can be made bigger in Fallout Shelter?
Lemme keep it simple: almost any room can get bigger. Just stick 'em side by side and boom, you got a mega room. More room, more power (or food, or water, or beds).
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In Fallout Shelter, you can merge most types of rooms to make them bigger and more efficient. Just build two or three of the same type of room next to each other, and they'll automatically merge, increasing capacity and efficiency. This works for resource-producing rooms like the Power Generator, Diner, and Water Treatment rooms, as well as others like the barracks for dwelling capacity. Just make sure they're on the same floor and at the same upgrade level!
Actually, not every room can be expanded. Rooms like the Vault Door can't be merged or expanded. Stick to merging production and living quarters for the best effect.
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