The missions are available in the Starcraft Demo or downloaded as the precursor campaign, which requires the full version of StarCraft. The demo only includes four missions, including the tutorial, while the downloadable precursor campaign includes two extra missions that fit in between the existing missions. The multiplayer mode of the demo is very limited, the player is able to play only terran, and has only one map available, "Byways" (2 players, badlands tileset).