(4.800.000 gold) works almost every time when you submit and (25.000 food+Random Gold) works as well, but not every time. When i tried to submit (50 Gems or random reward) i lost all my Gems , had only 12 anyways and (random 4-24 Gems) gave me only few gems, 1 at the time and thats it. The rest of the cheats in the list are not working at all.
And if u want to get rid of annoying pop-ups and skip adverts with firefox
you can use these
Cheers