Azure Sheep is a single player mod for Half-Life. The player is one of the Barney guards that is on post in one of the entrances of the Black Mesa facility When the chaos starts you realize that Kate, your college, code name 'Azure Sheep' is in the complex and in big dangers. You decide to rescue her... Compatible with Steam. Download links can be found here. The above page also includes a patch to make Azure Sheep more compatible with Steam.