Dragon City is a game on Facebook where you can breed, raise, and sell exotic dragons. What makes this game easier to play is it's 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 up, completing certain quests, Dragon Combat including PVP in Combat Word, and in Tournaments.