Underworld is an Android app developed by Gaea Mobile Limited (5201 Great America Pkwy, CA 95054). Others apps created by Gaea Mobile Limited are: Dragons of Atlantis, Kingdoms of Camelot: Battle, Heroes of Camelot, Wartune.

Underworld first became available on 13 Jun 2014. It is estimated that Underworld has been downloaded between 1000000 and 5000000 times from the Play Store.

Underworld 5.51 requires the following permissions:

Allows applications to access information about networks.

Allows applications to access information about Wi-Fi networks.

Allows access to the list of accounts in the Accounts Service.

Allows applications to open network sockets.

Allows read only access to phone state, including the phone number of the device, current cellular network information, the status of any ongoing calls, and a list of any PhoneAccounts registered on the device.

Allows an application to write to external storage.