Minerals are one of the two main resources in StarCraft, the real-time strategy game released by Blizzard Entertainment in 1998, gathered by worker units to pay for buildings, units and upgrades. When a purchase cannot be afforded, the game plays a short advisor alert instead of completing the order, making the warning one of the most repeated lines in a normal match. As StarCraft clips and strategy memes spread online, that alert escaped the game and became shorthand among RTS players for any plan stopped by a simple lack of resources.