Letter Mystery is an Android app developed by G5 Entertainment (Birger Jarlsgatan 18, Stockholm 114 34, Sweden).

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

Letter Mystery 1.10.58 requires the following permissions:

Allows applications to access information about networks.

Allows applications to connect to paired bluetooth devices.

Required to be able to access the camera device.

Allows applications to open network sockets.

Allows an application to read the user's contacts data.

Allows an application to read from external storage.

Allows using PowerManager WakeLocks to keep processor from sleeping or screen from dimming.

Allows an application to write to external storage.