Clash of clan
There are no official cheats for Clash of Clans. There are people who try to hack or exploit the game in order to get free Gems, but Supercell are relatively generous in that department anyway, as they reward you with Gems for cleaning up obstacles in your base and for completing Achievements.
Furthermore, anyone offering you a download or Gems in exchange for your username or password are probably trying to get personal details from you and you should refuse to give them out. The developers work hard for a balanced game, and anyone getting free Gems compromises that - the best idea is to learn how to beat the game using your own tactics that no one else knows about, then you'll have a real advantage!
Added by: Rushel Aug 12th 2013, ID#2733