You can't the game is good but stupid
One can not really restart Dragon City on Facebook. The only real way to restart this game is to start a new Facebook. One may be able to delete things and what not, but it wont ever restart the whole game.
I emailed Teamlava, the producers and asked them if I could restart my account. They replied saying that for right now this game isn't able to restart.
Sadly, it's not possible. The only way is to buy a new device to play it on. Your device remembers what your farm is up to.
you cant restart but you can go start on a new evony world
You can't restart Empire and Allies only if it has menu that says new game wheres the restart button
On the title menu press up+b+select that should restart your game
go to new game and do what it says then you will erase your game
You start a new game and start over.
When it finishes or when you are versing a new person.
Select new game
If your game was autosaved, then the only way to really restart the game is by starting a brand new game
you can't unless you make a new account