The bigger your habitat, the more your dragons, the higher the level the MORE gold you get through this method.
Cheat Engine : Free Download Cheat Engine
Steps for Dragon City Cheats:
Open Dragon City
Open Cheat Engine
Learn how to select the correct Chrome process as shown in the video.
You should have 2 Earth Habitats. (Lets call them Habitat A and Habitat B)
Put 2 Earth Dragons in Habitat A.
In Cheat Engine, select Speedhack and set about 20.
Now your gold collection will be turbo speed.
Just keep collecting the gold until you get the popup error
Refresh the game
Notice now your Habitat A has NEGATIVE collection.
Do NOT click on it or you lose your coins.
Just move the 2 dragons over to Habitat B and Store Habitat A
Then place Habitat A back to your city and notice the negative coins have been reset.
Just repeat again for more coins.
Works for Food too !