Fans of Bethesda’s Fallout games on Xbox, PlayStation and PC got the news yesterday that Fallout 4 will be launched in November – and the company also threw in a surprise bonus in the form of an iOS game. Fallout Shelter is a kind of blend of SimCity, XCOM and FTL in which you create your own fallout shelter and try to keep its residents alive and happy.

As Overseer, you get to design the shelter and take care of its residents, but you can also send them out into the Wasteland to find additional armor, weapons and other handy loot … 

Fallout Shelter puts you in control of a state-of-the-art underground Vault from Vault-Tec. Build the perfect Vault, keep your Dwellers happy, and protect them from the dangers of the Wasteland.

Select from a variety of modern-day rooms to turn an excavation beneath 2,000 feet of bedrock into the very picture of Vault Life. Get to know your Dwellers and lead them to happiness. Find their ideal jobs and watch them flourish. Provide them with outfits, weapons, and training to improve their abilities.

The game is free to download and play, with in-app purchases ranging from $0.99 to $19.99 providing additional resources. It runs on iPhone, iPad and iPod touch on iOS 7.0 and up, but is optimized for iPhone 5, iPhone 6, and iPhone 6 Plus. No Internet connection is needed during play.

Fallout Shelter is a free download from iTunes.