Forge of Empires is a browser-based strategy game developed by InnoGames. The game was initially released on April 17, 2012 (open beta phase). In 2013, TV advertising helped the game reach 10 million user registrations. It was later released for the iPhone and iPad in 2014, as well as Android in 2015. The game is similar to both SimCity and Clash of Clans, but includes turn-based strategy elements.
Diamonds are the premium currency of the game thet can be bought with real money and can be spent on most aspects of the game. For example players can buy premium buildings, forge points, expansions, missing blueprints, goods etc.