i discovered a glitch, when you press the button to move a dragon on dragon city, and then head to the book at the side of the screen and look for the same dragon, sell it, and then put it in a habitat or the place where you store dragons the game crashes. but if you put it in the one where you store dragons instead of showing the screen about something that went wrong it exits out of the game and resumes your game when you last had that dragon.

I also discovered another glitch, if you're trying to get those bugs on the heroic race for feeding your dragons, if you have 2 or more weak dragons and you just keep pressing that feed button and the switch button at the same time you will get double the number of bugs, this glitch also caused your green food bar to be leveling up just stay green and add food points off-screen.