Battles against NPC (non-player characters) goblins and their pre-built towns take place in Clash of Clans single-player campaigns. Raid storage rooms and Town Halls to find varied Gold and Elixir rewards for each level. There are 50 different missions available in single-player mode for now, and each level contains three stars, a total of 150 stars in the game. Reaching 150 stars fulfills the requirement for the “Get those Goblins!” achievement, which gives 35 Gems.