StarCraft Master is a custom map released by Blizzard Entertainment. It is much like the Challenge Missions in Single Player and the objective is to complete 30 rounds of combat by microing your units carefully. There is often a trick to complete a round as well as hints available. Finally, there's a warp button that allows you to jump to any round, meaning that you don't have to complete all of them in one sitting. There are also achievements to be had from completing the rounds.