Lack any of the fundamental resources, and you will suffer the consequences. The smiley face on the top left side indicates how happy your dwellers are with your management. You must not let this turn red or drop below the lines. It is indicated in the small lines on the green vault vitals at the top of the screen. There is a minimum resource requirement for your shelter. You can earn them as you collect your resources. To build and upgrade rooms, you must have enough caps, which are the primary in-game currency. Placing the same type of room next to each other merges them together.īecause you are underground, you need to construct one elevator below another if you want to go a floor lower and expand. You can only build beside structures that are already there. Then, choose the room you want to put up.

You can do so by tapping on the hammer icon on the bottom right side of the screen. You must build a sufficient number of these rooms as you progress. The first thing you must do is set up essential rooms that produce resources like power, water, and food. To start the game, you need to choose a vault number, and you will be named Overseer of that specific vault.

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