Dragon City is a game on Facebook,made by Jan Kirby where you can breed, raise, and sell exotic dragons. What makes this game easier to play is its lack of 'energy' points that need to be refilled with time, like on most Facebook games. Another nice feature is the gems. While you can buy them, the
game makes it very easy to get more for free through a variety of methods such as leveling, completing certain quests, Dragon Combat including PVP in Combat World and in Tournaments.
The object of the game is to breed and raise many dragons to earn gold, with which you can buy more food to feed more dragons to get more gold! Pretty basic, but it gets pretty complicated!