Proxy

A proxy is a production building built outside a player's base, as close to the opponent as possible. This minimizes the distance attacking units will have to travel. Proxies are usually used only in the early parts of the game as part of a rush, where the extra time can provide a decisive advantage, as well as bring reinforcements to the battle faster.

Terrans and Protoss, in particular, are known for their proxy rushes. Terrans will double barracks or factory proxy. Protoss will single or double gateway, depending on the level of seriousness. A proxy robotics facility and robotics support bay is also popular.

Proxies are most often seen on maps where the terrain allows buildings to be built just outside a player's base. Multiple entrances to the main or natural also make a proxy more likely to succeed.

A proxy is different from a hidden building.