In-game DLC allows developers and publishers to use their own games as a platform for selling additional content to gamers
Valve has announced the arrival of in-game downloadable content to Steam. DLC can now be added to any game on Steam, regardless of whether it was originally purchased via Steam, at retail, or via other digital outlets. It is also a feature of Steamworks, the suite of free tools and services available to game developers and publishers. The first game to take advantage of this new in-game DLC capability is The Maw developed by Twisted Pixel Games. Their first DLC releases are levels entitled The Maw: Brute Force and The Maw: River Redirect. Each DLC level expands The Maw storyline by fitting in-between the original levels as "deleted scenes".