Can I play Land of Legends on multiple devices?

You can, but not at the same time, since the game saves your current progress.

If the progress has not changed since the previous save on the second device, turn off the Internet, log in to the game and close it; then turn on the Internet again, start the game and log in to it via your Facebook account. After that, the progress should be automatically updated.

The same version of the game must be installed on all your devices.