Playing SC2 is fun and it’s available online to download. However, there are many tips that you would like to keep in mind when you are playing the game: StarCraft II offers three playable factions, or races. You only need one Protoss combat unit for every two to three Zerg. Use workers to harvest minerals Train workers at your town hall Pay attention to your resources Construct buildings to expand your base Build overtop geysers to extract Vespene gas Assign workers to harvest gas Learn context-sensitive actions Construct a building capable of training combat units.