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In the Warcraft III and Expansion Set there is a handful of custom maps made by the programmers from Blizzard. One such game is a tower defence called "Skibi 's TD". One of the levels sends Tauren (Bull-like creatures that walk upright) that are also called Hell Bovine. Contrary to their stance when Starcraft was released ("there is no cow level"), everyone knew that the Cow Level really existed at that time, and clearly referenced this easter egg.