If you want your dwellers to be even happier, you can boost this further by successfully rushing a room (which adds 10% happiness), having the dweller procreate (50% increase in happiness), or building a Radio Room, which adds 1% happiness for each 10 charisma.
Not all dwellers are created equal! The dwellers that arrive at your vault or are born there can have decent SPECIAL, but if you want a really exceptional dweller then you’ll have to find them in lunchboxes.If you’re not sure where your dwellers should go (like if they have multiple high stats), you can drag them over the various rooms in your vault – when you find the best fit for your dweller the outline of the room will turn green. Keeping your dwellers happy is important, and might seem complicated at first, but Fallout Shelter makes it easy for you.