However, some demos provide content not available in the full game. An example of this was the "Age of Empires" demo which included a Hittites campaign and two maps not available in the full version. Also, the "Half-Life" demo "" is a self-contained game, adapted from material cut from the development of the main game. The demo for "The Stanley Parable" takes place in an area created specifically for the demo to show off the premise and humor of the game, as the narrator states multiple times that the player is taking part in a "video game demonstration".