GoldSrc (also known as GoldSource) is a 3-D video game engine created by Valve in 1996. It was the driving force behind many famous games of the late 90s, such as Half-Life Half-Life, Team Fortress Classic Team Fortress Classic, and Counter-Strike Counter-Strike. GoldSrc is a heavily modified version of the Quake engine, and runs on C++ programming code. GoldSource and its level editor, the Hammer World Editor, were released by Valve for public use, making it the source of countless community-made modifications. GoldSrc was replaced by its sequel engine, Source Source, in 2004, which currently holds 1st place as the choice for modders. Though GoldSrc is past its prime, many gamers still seek to use it for mods and level design.