Type map c0a0 at the console window to start on Half-Life with the Half-Life: They Hunger weapons instead of the normal weapons. Some of the enemies are also different. For example, Gman is now the Sheriff. The Scientists are now civilians. Barney looks different, and the head crab zombies are now zombies from Half-Life: They Hunger. While playing in this state, the game autosaves when it touches a autosave trigger. The voices are the same. For instance, the endgame level on Half-Life with Gman is the Sheriff, but Gman's voice plays on the Sheriff. Note: The Houndeyes on Half-Life are now zombie dogs, however they still use the Houndeye weapon that produces an electric field.